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authorAndrey Andreev <narf@devilix.net>2018-03-22 15:48:55 +0100
committerAndrey Andreev <narf@devilix.net>2018-03-22 15:48:55 +0100
commit71e647782764184e3aab4faffe6d99176758979f (patch)
tree74dbdd50a61cd5674915c144aca9ebbc00b235b8 /user_guide/libraries/config.html
parentb12fbad77bd69ca0c7624a9094c29b7691ea6107 (diff)
[ci skip] 3.1.8 release
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+
+
+<!DOCTYPE html>
+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
+<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+ <title>Config Class &mdash; CodeIgniter 3.1.8 documentation</title>
+
+
+
+
+ <link rel="shortcut icon" href="../_static/ci-icon.ico"/>
+
+
+
+ <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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+
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+
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+
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+ <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" />
+
+
+
+ <link rel="index" title="Index"
+ href="../genindex.html"/>
+ <link rel="search" title="Search" href="../search.html"/>
+ <link rel="top" title="CodeIgniter 3.1.8 documentation" href="../index.html"/>
+ <link rel="up" title="Libraries" href="index.html"/>
+ <link rel="next" title="Email Class" href="email.html"/>
+ <link rel="prev" title="Shopping Cart Class" href="cart.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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+<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
+</ul>
+</li>
+</ul>
+<ul class="current">
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
+</ul>
+</li>
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+<ul>
+<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/create_news_items.html">Create news items</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
+<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/views.html">Views</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
+</ul>
+</li>
+</ul>
+<ul class="current">
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
+</ul>
+</li>
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+
+ <div class="section" id="config-class">
+<h1>Config Class<a class="headerlink" href="#config-class" title="Permalink to this headline">¶</a></h1>
+<p>The Config class provides a means to retrieve configuration preferences.
+These preferences can come from the default config file
+(application/config/config.php) or from your own custom config files.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">This class is initialized automatically by the system so there
+is no need to do it manually.</p>
+</div>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#working-with-the-config-class" id="id1">Working with the Config Class</a><ul>
+<li><a class="reference internal" href="#anatomy-of-a-config-file" id="id2">Anatomy of a Config File</a></li>
+<li><a class="reference internal" href="#loading-a-config-file" id="id3">Loading a Config File</a><ul>
+<li><a class="reference internal" href="#manual-loading" id="id4">Manual Loading</a></li>
+<li><a class="reference internal" href="#auto-loading" id="id5">Auto-loading</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#fetching-config-items" id="id6">Fetching Config Items</a></li>
+<li><a class="reference internal" href="#setting-a-config-item" id="id7">Setting a Config Item</a></li>
+<li><a class="reference internal" href="#environments" id="id8">Environments</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#class-reference" id="id9">Class Reference</a></li>
+</ul>
+</div>
+<div class="custom-index container"></div><div class="section" id="working-with-the-config-class">
+<h2><a class="toc-backref" href="#id1">Working with the Config Class</a><a class="headerlink" href="#working-with-the-config-class" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="anatomy-of-a-config-file">
+<h3><a class="toc-backref" href="#id2">Anatomy of a Config File</a><a class="headerlink" href="#anatomy-of-a-config-file" title="Permalink to this headline">¶</a></h3>
+<p>By default, CodeIgniter has one primary config file, located at
+application/config/config.php. If you open the file using your text
+editor you’ll see that config items are stored in an array called
+$config.</p>
+<p>You can add your own config items to this file, or if you prefer to keep
+your configuration items separate (assuming you even need config items),
+simply create your own file and save it in config folder.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">If you do create your own config files use the same format as
+the primary one, storing your items in an array called $config.
+CodeIgniter will intelligently manage these files so there will be no
+conflict even though the array has the same name (assuming an array
+index is not named the same as another).</p>
+</div>
+</div>
+<div class="section" id="loading-a-config-file">
+<h3><a class="toc-backref" href="#id3">Loading a Config File</a><a class="headerlink" href="#loading-a-config-file" title="Permalink to this headline">¶</a></h3>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">CodeIgniter automatically loads the primary config file
+(application/config/config.php), so you will only need to load a config
+file if you have created your own.</p>
+</div>
+<p>There are two ways to load a config file:</p>
+<div class="section" id="manual-loading">
+<h4><a class="toc-backref" href="#id4">Manual Loading</a><a class="headerlink" href="#manual-loading" title="Permalink to this headline">¶</a></h4>
+<p>To load one of your custom config files you will use the following
+function within the <a class="reference internal" href="../general/controllers.html"><span class="doc">controller</span></a> that
+needs it:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">load</span><span class="p">(</span><span class="s1">&#39;filename&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Where filename is the name of your config file, without the .php file
+extension.</p>
+<p>If you need to load multiple config files normally they will be
+merged into one master config array. Name collisions can occur,
+however, if you have identically named array indexes in different
+config files. To avoid collisions you can set the second parameter to
+TRUE and each config file will be stored in an array index
+corresponding to the name of the config file. Example:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Stored in an array with this prototype: $this-&gt;config[&#39;blog_settings&#39;] = $config</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">load</span><span class="p">(</span><span class="s1">&#39;blog_settings&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Please see the section entitled Fetching Config Items below to learn
+how to retrieve config items set this way.</p>
+<p>The third parameter allows you to suppress errors in the event that a
+config file does not exist:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">load</span><span class="p">(</span><span class="s1">&#39;blog_settings&#39;</span><span class="p">,</span> <span class="k">FALSE</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="auto-loading">
+<h4><a class="toc-backref" href="#id5">Auto-loading</a><a class="headerlink" href="#auto-loading" title="Permalink to this headline">¶</a></h4>
+<p>If you find that you need a particular config file globally, you can
+have it loaded automatically by the system. To do this, open the
+<strong>autoload.php</strong> file, located at application/config/autoload.php,
+and add your config file as indicated in the file.</p>
+</div>
+</div>
+<div class="section" id="fetching-config-items">
+<h3><a class="toc-backref" href="#id6">Fetching Config Items</a><a class="headerlink" href="#fetching-config-items" title="Permalink to this headline">¶</a></h3>
+<p>To retrieve an item from your config file, use the following function:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;item_name&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Where item_name is the $config array index you want to retrieve. For
+example, to fetch your language choice you’ll do this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$lang</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;language&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>The function returns NULL if the item you are trying to fetch
+does not exist.</p>
+<p>If you are using the second parameter of the $this-&gt;config-&gt;load
+function in order to assign your config items to a specific index you
+can retrieve it by specifying the index name in the second parameter of
+the $this-&gt;config-&gt;item() function. Example:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Loads a config file named blog_settings.php and assigns it to an index named &quot;blog_settings&quot;</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">load</span><span class="p">(</span><span class="s1">&#39;blog_settings&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+
+<span class="c1">// Retrieve a config item named site_name contained within the blog_settings array</span>
+<span class="nv">$site_name</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;site_name&#39;</span><span class="p">,</span> <span class="s1">&#39;blog_settings&#39;</span><span class="p">);</span>
+
+<span class="c1">// An alternate way to specify the same item:</span>
+<span class="nv">$blog_config</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;blog_settings&#39;</span><span class="p">);</span>
+<span class="nv">$site_name</span> <span class="o">=</span> <span class="nv">$blog_config</span><span class="p">[</span><span class="s1">&#39;site_name&#39;</span><span class="p">];</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="setting-a-config-item">
+<h3><a class="toc-backref" href="#id7">Setting a Config Item</a><a class="headerlink" href="#setting-a-config-item" title="Permalink to this headline">¶</a></h3>
+<p>If you would like to dynamically set a config item or change an existing
+one, you can do so using:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">set_item</span><span class="p">(</span><span class="s1">&#39;item_name&#39;</span><span class="p">,</span> <span class="s1">&#39;item_value&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Where item_name is the $config array index you want to change, and
+item_value is its value.</p>
+</div>
+<div class="section" id="environments">
+<span id="config-environments"></span><h3><a class="toc-backref" href="#id8">Environments</a><a class="headerlink" href="#environments" title="Permalink to this headline">¶</a></h3>
+<p>You may load different configuration files depending on the current
+environment. The ENVIRONMENT constant is defined in index.php, and is
+described in detail in the <a class="reference internal" href="../general/environments.html"><span class="doc">Handling
+Environments</span></a> section.</p>
+<p>To create an environment-specific configuration file, create or copy a
+configuration file in application/config/{ENVIRONMENT}/{FILENAME}.php</p>
+<p>For example, to create a production-only config.php, you would:</p>
+<ol class="arabic simple">
+<li>Create the directory application/config/production/</li>
+<li>Copy your existing config.php into the above directory</li>
+<li>Edit application/config/production/config.php so it contains your
+production settings</li>
+</ol>
+<p>When you set the ENVIRONMENT constant to ‘production’, the settings for
+your new production-only config.php will be loaded.</p>
+<p>You can place the following configuration files in environment-specific
+folders:</p>
+<ul class="simple">
+<li>Default CodeIgniter configuration files</li>
+<li>Your own custom configuration files</li>
+</ul>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">CodeIgniter always loads the global config file first (i.e., the one in application/config/),
+then tries to load the configuration files for the current environment.
+This means you are not obligated to place <strong>all</strong> of your configuration files in an
+environment folder. Only the files that change per environment. Additionally you don’t
+have to copy <strong>all</strong> the config items in the environment config file. Only the config items
+that you wish to change for your environment. The config items declared in your environment
+folders always overwrite those in your global config files.</p>
+</div>
+</div>
+</div>
+<div class="section" id="class-reference">
+<h2><a class="toc-backref" href="#id9">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
+<dl class="class">
+<dt id="CI_Config">
+<em class="property">class </em><code class="descname">CI_Config</code><a class="headerlink" href="#CI_Config" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="attribute">
+<dt>
+<code class="descname">$config</code></dt>
+<dd><p>Array of all loaded config values</p>
+</dd></dl>
+
+<dl class="attribute">
+<dt>
+<code class="descname">$is_loaded</code></dt>
+<dd><p>Array of all loaded config files</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::item">
+<code class="descname">item</code><span class="sig-paren">(</span><em>$item</em><span class="optional">[</span>, <em>$index=''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::item" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$item</strong> (<em>string</em>) – Config item name</li>
+<li><strong>$index</strong> (<em>string</em>) – Index name</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Config item value or NULL if not found</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Fetch a config file item.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::set_item">
+<code class="descname">set_item</code><span class="sig-paren">(</span><em>$item</em>, <em>$value</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::set_item" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$item</strong> (<em>string</em>) – Config item name</li>
+<li><strong>$value</strong> (<em>string</em>) – Config item value</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Sets a config file item to the specified value.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::slash_item">
+<code class="descname">slash_item</code><span class="sig-paren">(</span><em>$item</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::slash_item" 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>$item</strong> (<em>string</em>) – config item name</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Config item value with a trailing forward slash or NULL if not found</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>This method is identical to <code class="docutils literal"><span class="pre">item()</span></code>, except it appends a forward
+slash to the end of the item, if it exists.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::load">
+<code class="descname">load</code><span class="sig-paren">(</span><span class="optional">[</span><em>$file = ''</em><span class="optional">[</span>, <em>$use_sections = FALSE</em><span class="optional">[</span>, <em>$fail_gracefully = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::load" 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>$file</strong> (<em>string</em>) – Configuration file name</li>
+<li><strong>$use_sections</strong> (<em>bool</em>) – Whether config values should be loaded into their own section (index of the main config array)</li>
+<li><strong>$fail_gracefully</strong> (<em>bool</em>) – Whether to return FALSE or to display an error message</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Loads a configuration file.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::site_url">
+<code class="descname">site_url</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::site_url" 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">Returns:</th><td class="field-body">Site URL</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
+</tr>
+</tbody>
+</table>
+<p>This method retrieves the URL to your site, along with the “index” value
+you’ve specified in the config file.</p>
+<p>This method is normally accessed via the corresponding functions in the
+<a class="reference internal" href="../helpers/url_helper.html"><span class="doc">URL Helper</span></a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::base_url">
+<code class="descname">base_url</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::base_url" 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">Returns:</th><td class="field-body">Base URL</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
+</tr>
+</tbody>
+</table>
+<p>This method retrieves the URL to your site, plus an optional path such
+as to a stylesheet or image.</p>
+<p>This method is normally accessed via the corresponding functions in the
+<a class="reference internal" href="../helpers/url_helper.html"><span class="doc">URL Helper</span></a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Config::system_url">
+<code class="descname">system_url</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Config::system_url" 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">Returns:</th><td class="field-body">URL pointing at your CI system/ directory</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
+</tr>
+</tbody>
+</table>
+<p>This method retrieves the URL to your CodeIgniter system/ directory.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">This method is DEPRECATED because it encourages usage of
+insecure coding practices. Your <em>system/</em> directory shouldn’t
+be publicly accessible.</p>
+</div>
+</dd></dl>
+
+</dd></dl>
+
+</div>
+</div>
+
+
+ </div>
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+ &copy; Copyright 2014 - 2018, British Columbia Institute of Technology.
+ Last updated on Mar 22, 2018.
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