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copied!<p>Many frameworks do have autoloaders, one that does not is <strong>CodeIgniter</strong> and you have to specify which classes you want to load all the time and which classes you want to load inside your controllers / models / views / libraries.</p> <p>It isn't completely necessary, but it is nice because it generally enforces a file structure and you also don't have to worry about remembering to include files at the top of your scripts.</p> <p><strong>[Edit]</strong></p> <p>Apparently clarification is needed on my <code>CodeIgniter</code> statement. Yes there is an <code>auto_load</code> place that lets you specify the libraries/modules that you want to load automatically at the start of every script, and yes there is a loader library, but they are not the same as a real autoloader.</p> <p>You have to specify which ones you want at the start, it doesn't know that you want to load the Pizza_Store modle until you use the custom </p> <pre><code>$this->load->model->('foo'); </code></pre> <p>which is equivalent to </p> <pre><code>include 'application/models/foo.php'; $this->Foo = new foo(); </code></pre> <p>But is not really the same as only having to call <code>$this->foo = new Models_Foo();</code> and CodeIgniter knowing what you mean by it, which is what happens when an autoloader is used.</p> <p><strong>[Edit part deux]</strong></p> <p>Nowehere in the code does it say <code>__autoload</code>, <code>spl_autoload</code> or <code>spl_autoload_register</code>. This is because it maintains PHP 4 compatibility. It is just the way that the framework has been built, there is a false autoload as I stated above, but it does this for each "autoloaded" class:</p> <pre><code>foreach($autoloaded_class as $type=>$class){ if(is_application_class($class)){ include "application/{$type}/{$class}.php"; } elseif(is_core($class)){ include "core/{$type}/{$class}.php"; } } $array['Foo'] = new Foo(); $controller($array); </code></pre> <p>Which is essentially calling:</p> <p>include 'foo.php';</p> <p>at the top of every file no matter if you need it or not.</p>

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