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    <p>That's a confusing name for the file, as autoloading is a mechanism in PHP that allows you to load classes as and when they are needed, a good solution when you have many classes and only a few will be needed for each execution.</p> <p>For example:</p> <pre><code>function autoload($class_name) { $file = "classes/$class_name.php"; // You could add some checks here (e.g. whether the file exists, whether the // class indeed exists after the file is loaded) to facilitate better errors, // of course this would marginally increase the time needed to load each class. require $file; } // Register the `autoload` function with PHP's autoload mechanism spl_autoload_register('autoload'); // This will execute `autoload('Class')` (unless `Class` is already defined) $instance = new Class; </code></pre> <p>So, to answer your questions:</p> <ol> <li><p>It is not necessary to load them all, however classes that are used must be available, either by loading them all together (current situation), loading them conditionally (<code>if(p == 'whatever') require 'classes/whatever.php'</code>), or by using autoloading.</p></li> <li><p>There is some delay whenever a file is included as the file must be parsed/executed. PHP is fairly fast but still, including files you do not need is a waste. If you're using bytecode caching, the retrieved bytecode must still be executed.</p></li> <li><p>That is one avenue of improvement, autoloading presents a more dynamic alternative.</p></li> <li><p>Dependencies may be a problem if any of your page classes depend on another class, as your conditional loading could get very bloated.</p></li> </ol> <p>Also a little additional material regarding bytecode caching, if you're using it:</p> <ul> <li><a href="https://stackoverflow.com/questions/1941541/php5-frameworks-autoloading-and-opcode-caching">PHP5 Frameworks: Autoloading and Opcode Caching</a></li> <li><a href="https://stackoverflow.com/questions/1396501/do-php-opcode-cache-work-with-autoload">Do PHP opcode cache work with __autoload?</a></li> </ul> <p>The summary seems to be that, as long as you use <code>include</code> or <code>require</code> to load the file, bytecode caching will work as intended.</p>
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