676 lines
51 KiB
HTML
Executable File
676 lines
51 KiB
HTML
Executable File
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<!DOCTYPE html>
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<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>CAPTCHA Helper — CodeIgniter 3.1.11 documentation</title>
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<link rel="shortcut icon" href="../_static/ci-icon.ico"/>
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<link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'>
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<link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" />
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<link rel="index" title="Index"
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href="../genindex.html"/>
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<link rel="search" title="Search" href="../search.html"/>
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<link rel="top" title="CodeIgniter 3.1.11 documentation" href="../index.html"/>
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<link rel="up" title="Helpers" href="index.html"/>
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<link rel="next" title="Cookie Helper" href="cookie_helper.html"/>
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<link rel="prev" title="Array Helper" href="array_helper.html"/>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
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</head>
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<body class="wy-body-for-nav" role="document">
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<div id="nav">
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<div id="nav_inner">
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<div id="pulldown-menu" class="ciNav">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a></li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Helpers</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="array_helper.html">Array Helper</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div id="nav2">
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<a href="#" id="openToc">
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<img src="data:image/jpeg;base64,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" title="Toggle Table of Contents" alt="Toggle Table of Contents" />
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</a>
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<div class="section" id="captcha-helper">
|
||
<h1>CAPTCHA Helper<a class="headerlink" href="#captcha-helper" title="Permalink to this headline">¶</a></h1>
|
||
<p>The CAPTCHA Helper file contains functions that assist in creating
|
||
CAPTCHA images.</p>
|
||
<div class="contents local topic" id="contents">
|
||
<ul class="simple">
|
||
<li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li>
|
||
<li><a class="reference internal" href="#using-the-captcha-helper" id="id2">Using the CAPTCHA helper</a><ul>
|
||
<li><a class="reference internal" href="#adding-a-database" id="id3">Adding a Database</a></li>
|
||
</ul>
|
||
</li>
|
||
<li><a class="reference internal" href="#available-functions" id="id4">Available Functions</a></li>
|
||
</ul>
|
||
</div>
|
||
<div class="custom-index container"></div><div class="section" id="loading-this-helper">
|
||
<h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline">¶</a></h2>
|
||
<p>This helper is loaded using the following code:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'captcha'</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="using-the-captcha-helper">
|
||
<h2><a class="toc-backref" href="#id2">Using the CAPTCHA helper</a><a class="headerlink" href="#using-the-captcha-helper" title="Permalink to this headline">¶</a></h2>
|
||
<p>Once loaded you can generate a CAPTCHA like this:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$vals</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'word'</span> <span class="o">=></span> <span class="s1">'Random word'</span><span class="p">,</span>
|
||
<span class="s1">'img_path'</span> <span class="o">=></span> <span class="s1">'./captcha/'</span><span class="p">,</span>
|
||
<span class="s1">'img_url'</span> <span class="o">=></span> <span class="s1">'http://example.com/captcha/'</span><span class="p">,</span>
|
||
<span class="s1">'font_path'</span> <span class="o">=></span> <span class="s1">'./path/to/fonts/texb.ttf'</span><span class="p">,</span>
|
||
<span class="s1">'img_width'</span> <span class="o">=></span> <span class="s1">'150'</span><span class="p">,</span>
|
||
<span class="s1">'img_height'</span> <span class="o">=></span> <span class="mi">30</span><span class="p">,</span>
|
||
<span class="s1">'expiration'</span> <span class="o">=></span> <span class="mi">7200</span><span class="p">,</span>
|
||
<span class="s1">'word_length'</span> <span class="o">=></span> <span class="mi">8</span><span class="p">,</span>
|
||
<span class="s1">'font_size'</span> <span class="o">=></span> <span class="mi">16</span><span class="p">,</span>
|
||
<span class="s1">'img_id'</span> <span class="o">=></span> <span class="s1">'Imageid'</span><span class="p">,</span>
|
||
<span class="s1">'pool'</span> <span class="o">=></span> <span class="s1">'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'</span><span class="p">,</span>
|
||
|
||
<span class="c1">// White background and border, black text and red grid</span>
|
||
<span class="s1">'colors'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'background'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">),</span>
|
||
<span class="s1">'border'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">),</span>
|
||
<span class="s1">'text'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span>
|
||
<span class="s1">'grid'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">40</span><span class="p">,</span> <span class="mi">40</span><span class="p">)</span>
|
||
<span class="p">)</span>
|
||
<span class="p">);</span>
|
||
|
||
<span class="nv">$cap</span> <span class="o">=</span> <span class="nx">create_captcha</span><span class="p">(</span><span class="nv">$vals</span><span class="p">);</span>
|
||
<span class="k">echo</span> <span class="nv">$cap</span><span class="p">[</span><span class="s1">'image'</span><span class="p">];</span>
|
||
</pre></div>
|
||
</div>
|
||
<ul class="simple">
|
||
<li>The captcha function requires the GD image library.</li>
|
||
<li>Only the <strong>img_path</strong> and <strong>img_url</strong> are required.</li>
|
||
<li>If a <strong>word</strong> is not supplied, the function will generate a random
|
||
ASCII string. You might put together your own word library that you
|
||
can draw randomly from.</li>
|
||
<li>If you do not specify a path to a TRUE TYPE font, the native ugly GD
|
||
font will be used.</li>
|
||
<li>The “captcha” directory must be writable</li>
|
||
<li>The <strong>expiration</strong> (in seconds) signifies how long an image will remain
|
||
in the captcha folder before it will be deleted. The default is two
|
||
hours.</li>
|
||
<li><strong>word_length</strong> defaults to 8, <strong>pool</strong> defaults to ‘0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ’</li>
|
||
<li><strong>font_size</strong> defaults to 16, the native GD font has a size limit. Specify a “true type” font for bigger sizes.</li>
|
||
<li>The <strong>img_id</strong> will be set as the “id” of the captcha image.</li>
|
||
<li>If any of the <strong>colors</strong> values is missing, it will be replaced by the default.</li>
|
||
</ul>
|
||
<div class="section" id="adding-a-database">
|
||
<h3><a class="toc-backref" href="#id3">Adding a Database</a><a class="headerlink" href="#adding-a-database" title="Permalink to this headline">¶</a></h3>
|
||
<p>In order for the captcha function to prevent someone from submitting,
|
||
you will need to add the information returned from <code class="docutils literal"><span class="pre">create_captcha()</span></code>
|
||
to your database. Then, when the data from the form is submitted by
|
||
the user you will need to verify that the data exists in the database
|
||
and has not expired.</p>
|
||
<p>Here is a table prototype:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="nx">captcha</span> <span class="p">(</span>
|
||
<span class="nx">captcha_id</span> <span class="nx">bigint</span><span class="p">(</span><span class="mi">13</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="nx">auto_increment</span><span class="p">,</span>
|
||
<span class="nx">captcha_time</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">ip_address</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">word</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">20</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
|
||
<span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="sb">`captcha_id`</span> <span class="p">(</span><span class="sb">`captcha_id`</span><span class="p">),</span>
|
||
<span class="nx">KEY</span> <span class="sb">`word`</span> <span class="p">(</span><span class="sb">`word`</span><span class="p">)</span>
|
||
<span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Here is an example of usage with a database. On the page where the
|
||
CAPTCHA will be shown you’ll have something like this:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'captcha'</span><span class="p">);</span>
|
||
<span class="nv">$vals</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'img_path'</span> <span class="o">=></span> <span class="s1">'./captcha/'</span><span class="p">,</span>
|
||
<span class="s1">'img_url'</span> <span class="o">=></span> <span class="s1">'http://example.com/captcha/'</span>
|
||
<span class="p">);</span>
|
||
|
||
<span class="nv">$cap</span> <span class="o">=</span> <span class="nx">create_captcha</span><span class="p">(</span><span class="nv">$vals</span><span class="p">);</span>
|
||
<span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'captcha_time'</span> <span class="o">=></span> <span class="nv">$cap</span><span class="p">[</span><span class="s1">'time'</span><span class="p">],</span>
|
||
<span class="s1">'ip_address'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">ip_address</span><span class="p">(),</span>
|
||
<span class="s1">'word'</span> <span class="o">=></span> <span class="nv">$cap</span><span class="p">[</span><span class="s1">'word'</span><span class="p">]</span>
|
||
<span class="p">);</span>
|
||
|
||
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">insert_string</span><span class="p">(</span><span class="s1">'captcha'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="nv">$query</span><span class="p">);</span>
|
||
|
||
<span class="k">echo</span> <span class="s1">'Submit the word you see below:'</span><span class="p">;</span>
|
||
<span class="k">echo</span> <span class="nv">$cap</span><span class="p">[</span><span class="s1">'image'</span><span class="p">];</span>
|
||
<span class="k">echo</span> <span class="s1">'<input type="text" name="captcha" value="" />'</span><span class="p">;</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>Then, on the page that accepts the submission you’ll have something like
|
||
this:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// First, delete old captchas</span>
|
||
<span class="nv">$expiration</span> <span class="o">=</span> <span class="nb">time</span><span class="p">()</span> <span class="o">-</span> <span class="mi">7200</span><span class="p">;</span> <span class="c1">// Two hour limit</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">where</span><span class="p">(</span><span class="s1">'captcha_time < '</span><span class="p">,</span> <span class="nv">$expiration</span><span class="p">)</span>
|
||
<span class="o">-></span><span class="na">delete</span><span class="p">(</span><span class="s1">'captcha'</span><span class="p">);</span>
|
||
|
||
<span class="c1">// Then see if a captcha exists:</span>
|
||
<span class="nv">$sql</span> <span class="o">=</span> <span class="s1">'SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time > ?'</span><span class="p">;</span>
|
||
<span class="nv">$binds</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="nv">$_POST</span><span class="p">[</span><span class="s1">'captcha'</span><span class="p">],</span> <span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">ip_address</span><span class="p">(),</span> <span class="nv">$expiration</span><span class="p">);</span>
|
||
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="nv">$sql</span><span class="p">,</span> <span class="nv">$binds</span><span class="p">);</span>
|
||
<span class="nv">$row</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-></span><span class="na">row</span><span class="p">();</span>
|
||
|
||
<span class="k">if</span> <span class="p">(</span><span class="nv">$row</span><span class="o">-></span><span class="na">count</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span>
|
||
<span class="p">{</span>
|
||
<span class="k">echo</span> <span class="s1">'You must submit the word that appears in the image.'</span><span class="p">;</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="available-functions">
|
||
<h2><a class="toc-backref" href="#id4">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2>
|
||
<p>The following functions are available:</p>
|
||
<dl class="function">
|
||
<dt id="create_captcha">
|
||
<code class="descname">create_captcha</code><span class="sig-paren">(</span><span class="optional">[</span><em>$data = ''</em><span class="optional">[</span>, <em>$img_path = ''</em><span class="optional">[</span>, <em>$img_url = ''</em><span class="optional">[</span>, <em>$font_path = ''</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#create_captcha" title="Permalink to this definition">¶</a></dt>
|
||
<dd><table class="docutils field-list" frame="void" rules="none">
|
||
<col class="field-name" />
|
||
<col class="field-body" />
|
||
<tbody valign="top">
|
||
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
|
||
<li><strong>$data</strong> (<em>array</em>) – Array of data for the CAPTCHA</li>
|
||
<li><strong>$img_path</strong> (<em>string</em>) – Path to create the image in (DEPRECATED)</li>
|
||
<li><strong>$img_url</strong> (<em>string</em>) – URL to the CAPTCHA image folder (DEPRECATED)</li>
|
||
<li><strong>$font_path</strong> (<em>string</em>) – Server path to font (DEPRECATED)</li>
|
||
</ul>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">array(‘word’ => $word, ‘time’ => $now, ‘image’ => $img)</p>
|
||
</td>
|
||
</tr>
|
||
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>Takes an array of information to generate the CAPTCHA as input and
|
||
creates the image to your specifications, returning an array of
|
||
associative data about the image.</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">array</span><span class="p">(</span>
|
||
<span class="s1">'image'</span> <span class="o">=></span> <span class="nx">IMAGE</span> <span class="nx">TAG</span>
|
||
<span class="s1">'time'</span> <span class="o">=></span> <span class="nx">TIMESTAMP</span> <span class="p">(</span><span class="nx">in</span> <span class="nb">microtime</span><span class="p">)</span>
|
||
<span class="s1">'word'</span> <span class="o">=></span> <span class="nx">CAPTCHA</span> <span class="nx">WORD</span>
|
||
<span class="p">)</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The <strong>image</strong> is the actual image tag:</p>
|
||
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><</span><span class="nx">img</span> <span class="nx">src</span><span class="o">=</span><span class="s2">"http://example.com/captcha/12345.jpg"</span> <span class="nx">width</span><span class="o">=</span><span class="s2">"140"</span> <span class="nx">height</span><span class="o">=</span><span class="s2">"50"</span> <span class="o">/></span>
|
||
</pre></div>
|
||
</div>
|
||
<p>The <strong>time</strong> is the micro timestamp used as the image name without the
|
||
file extension. It will be a number like this: 1139612155.3422</p>
|
||
<p>The <strong>word</strong> is the word that appears in the captcha image, which if not
|
||
supplied to the function, will be a random string.</p>
|
||
<div class="admonition note">
|
||
<p class="first admonition-title">Note</p>
|
||
<p class="last">Usage of the <code class="docutils literal"><span class="pre">$img_path</span></code>, <code class="docutils literal"><span class="pre">$img_url</span></code> and <code class="docutils literal"><span class="pre">$font_path</span></code>
|
||
parameters is DEPRECATED. Provide them in the <code class="docutils literal"><span class="pre">$data</span></code> array
|
||
instead.</p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
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|
||
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|
||
|
||
|
||
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|
||
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||
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|
||
<p>
|
||
© Copyright 2014 - 2019, British Columbia Institute of Technology.
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Last updated on Sep 19, 2019.
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