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264<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
265<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
266<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
267</ul>
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271<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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273<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
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276</ul>
277<ul>
278<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
279<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
280<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
281<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
282<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
283<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
284<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
285<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
286<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
287<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
288<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
289<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
290<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
291<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
292<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
293<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
294<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
295<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
296<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
297<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
298<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
299<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
300<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
301<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
302<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
303<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
304<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
305</ul>
306</li>
307</ul>
308<ul>
309<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
310<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
311<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
312<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
313<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
314<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
315<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
316<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
317<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
318<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
319<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
320<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
321<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
322<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
323<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
324<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
325<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
326<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
327<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
328<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
329<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
330<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
331<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
332<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
333<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
334<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
335<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
336<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
337<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
338<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
339<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
340</ul>
341</li>
342</ul>
343<ul>
344<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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346<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
347<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
348<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
349<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
351<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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353<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
354<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
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356<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
357<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
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380<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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382<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
383<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
384<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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425 <div class="section" id="codeigniter-at-a-glance">
426<h1>CodeIgniter at a Glance<a class="headerlink" href="#codeigniter-at-a-glance" title="Permalink to this headline"></a></h1>
427<div class="section" id="codeigniter-is-an-application-framework">
428<h2>CodeIgniter is an Application Framework<a class="headerlink" href="#codeigniter-is-an-application-framework" title="Permalink to this headline"></a></h2>
429<p>CodeIgniter is a toolkit for people who build web applications using
430PHP. Its goal is to enable you to develop projects much faster than you
431could if you were writing code from scratch, by providing a rich set of
432libraries for commonly needed tasks, as well as a simple interface and
433logical structure to access these libraries. CodeIgniter lets you
434creatively focus on your project by minimizing the amount of code needed
435for a given task.</p>
436</div>
437<div class="section" id="codeigniter-is-free">
438<h2>CodeIgniter is Free<a class="headerlink" href="#codeigniter-is-free" title="Permalink to this headline"></a></h2>
439<p>CodeIgniter is licensed under the MIT license so you can use it however
440you please. For more information please read the
441<a class="reference internal" href="../license.html"><span class="doc">license agreement</span></a>.</p>
442</div>
443<div class="section" id="codeigniter-is-light-weight">
444<h2>CodeIgniter is Light Weight<a class="headerlink" href="#codeigniter-is-light-weight" title="Permalink to this headline"></a></h2>
445<p>Truly light weight. The core system requires only a few very small
446libraries. This is in stark contrast to many frameworks that require
447significantly more resources. Additional libraries are loaded
448dynamically upon request, based on your needs for a given process, so
449the base system is very lean and quite fast.</p>
450</div>
451<div class="section" id="codeigniter-is-fast">
452<h2>CodeIgniter is Fast<a class="headerlink" href="#codeigniter-is-fast" title="Permalink to this headline"></a></h2>
453<p>Really fast. We challenge you to find a framework that has better
454performance than CodeIgniter.</p>
455</div>
456<div class="section" id="codeigniter-uses-m-v-c">
457<h2>CodeIgniter Uses M-V-C<a class="headerlink" href="#codeigniter-uses-m-v-c" title="Permalink to this headline"></a></h2>
458<p>CodeIgniter uses the Model-View-Controller approach, which allows great
459separation between logic and presentation. This is particularly good for
460projects in which designers are working with your template files, as the
461code these files contain will be minimized. We describe MVC in more
462detail on its own page.</p>
463</div>
464<div class="section" id="codeigniter-generates-clean-urls">
465<h2>CodeIgniter Generates Clean URLs<a class="headerlink" href="#codeigniter-generates-clean-urls" title="Permalink to this headline"></a></h2>
466<p>The URLs generated by CodeIgniter are clean and search-engine friendly.
467Rather than using the standard “query string” approach to URLs that is
468synonymous with dynamic systems, CodeIgniter uses a segment-based
469approach:</p>
470<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">news</span><span class="o">/</span><span class="nx">article</span><span class="o">/</span><span class="mi">345</span>
471</pre></div>
472</div>
473<div class="admonition note">
474<p class="first admonition-title">Note</p>
475<p class="last">By default the <em>index.php</em> file is included in the URL but it can
476be removed using a simple <em>.htaccess</em> file.</p>
477</div>
478</div>
479<div class="section" id="codeigniter-packs-a-punch">
480<h2>CodeIgniter Packs a Punch<a class="headerlink" href="#codeigniter-packs-a-punch" title="Permalink to this headline"></a></h2>
481<p>CodeIgniter comes with full-range of libraries that enable the most
482commonly needed web development tasks, like accessing a database,
483sending email, validating form data, maintaining sessions, manipulating
484images, working with XML-RPC data and much more.</p>
485</div>
486<div class="section" id="codeigniter-is-extensible">
487<h2>CodeIgniter is Extensible<a class="headerlink" href="#codeigniter-is-extensible" title="Permalink to this headline"></a></h2>
488<p>The system can be easily extended through the use of your own libraries,
489helpers, or through class extensions or system hooks.</p>
490</div>
491<div class="section" id="codeigniter-does-not-require-a-template-engine">
492<h2>CodeIgniter Does Not Require a Template Engine<a class="headerlink" href="#codeigniter-does-not-require-a-template-engine" title="Permalink to this headline"></a></h2>
493<p>Although CodeIgniter <em>does</em> come with a simple template parser that can
494be optionally used, it does not force you to use one. Template engines
495simply can not match the performance of native PHP, and the syntax that
496must be learned to use a template engine is usually only marginally
497easier than learning the basics of PHP. Consider this block of PHP code:</p>
498<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">ul</span><span class="o">&gt;</span>
499<span class="o">&lt;?</span><span class="nx">php</span> <span class="k">foreach</span> <span class="p">(</span><span class="nv">$addressbook</span> <span class="k">as</span> <span class="nv">$name</span><span class="p">)</span><span class="o">:</span><span class="cp">?&gt;</span>
500 <span class="p">&lt;</span><span class="nt">li</span><span class="p">&gt;</span><span class="cp">&lt;?</span><span class="o">=</span><span class="nv">$name</span><span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">li</span><span class="p">&gt;</span>
501<span class="cp">&lt;?php</span> <span class="k">endforeach</span><span class="p">;</span> <span class="cp">?&gt;</span>
502<span class="p">&lt;/</span><span class="nt">ul</span><span class="p">&gt;</span>
503</pre></div>
504</div>
505<p>Contrast this with the pseudo-code used by a template engine:</p>
506<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">ul</span><span class="o">&gt;</span>
507<span class="p">{</span><span class="k">foreach</span> <span class="nx">from</span><span class="o">=</span><span class="nv">$addressbook</span> <span class="nx">item</span><span class="o">=</span><span class="s2">&quot;name&quot;</span><span class="p">}</span>
508 <span class="o">&lt;</span><span class="nx">li</span><span class="o">&gt;</span><span class="p">{</span><span class="nv">$name</span><span class="p">}</span><span class="o">&lt;/</span><span class="nx">li</span><span class="o">&gt;</span>
509<span class="p">{</span><span class="o">/</span><span class="k">foreach</span><span class="p">}</span>
510<span class="o">&lt;/</span><span class="nx">ul</span><span class="o">&gt;</span>
511</pre></div>
512</div>
513<p>Yes, the template engine example is a bit cleaner, but it comes at the
514price of performance, as the pseudo-code must be converted back into PHP
515to run. Since one of our goals is <em>maximum performance</em>, we opted to not
516require the use of a template engine.</p>
517</div>
518<div class="section" id="codeigniter-is-thoroughly-documented">
519<h2>CodeIgniter is Thoroughly Documented<a class="headerlink" href="#codeigniter-is-thoroughly-documented" title="Permalink to this headline"></a></h2>
520<p>Programmers love to code and hate to write documentation. We’re no
521different, of course, but since documentation is <strong>as important</strong> as the
522code itself, we are committed to doing it. Our source code is extremely
523clean and well commented as well.</p>
524</div>
525<div class="section" id="codeigniter-has-a-friendly-community-of-users">
526<h2>CodeIgniter has a Friendly Community of Users<a class="headerlink" href="#codeigniter-has-a-friendly-community-of-users" title="Permalink to this headline"></a></h2>
527<p>Our growing community of users can be seen actively participating in our
528<a class="reference external" href="http://forum.codeigniter.com/">Community Forums</a>.</p>
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