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2008-08-23T09:37:32.237
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I my applications I usually have <code>setup.php</code> file that includes all core classes (i.e. framework and accompanying libraries). My custom classes are loaded using autoloader aided by directory layout map. Each time new class is added I run command line builder script that scans whole directory tree in search for model classes then builds associative array with class names as keys and paths as values. Then, __autoload function looks up class name in that array and gets include path. Here's the code: autobuild.php <pre><code>define('MAP', 'var/cache/autoload.map'); error_reporting(E_ALL); require 'setup.php'; print(buildAutoloaderMap() . " classes mapped\n"); function buildAutoloaderMap() { $dirs = array('lib', 'view', 'model'); $cache = array(); $n = 0; foreach ($dirs as $dir) { foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir)) as $entry) { $fn = $entry->getFilename(); if (!preg_match('/\.class\.php$/', $fn)) continue; $c = str_replace('.class.php', '', $fn); if (!class_exists($c)) { $cache[$c] = ($pn = $entry->getPathname()); ++$n; } } } ksort($cache); file_put_contents(MAP, serialize($cache)); return $n; } </code></pre> autoload.php <pre><code>define('MAP', 'var/cache/autoload.map'); function __autoload($className) { static $map; $map or ($map = unserialize(file_get_contents(MAP))); $fn = array_key_exists($className, $map) ? $map[$className] : null; if ($fn and file_exists($fn)) { include $fn; unset($map[$className]); } } </code></pre> Note that file naming convention must be [class_name].class.php. Alter the directories classes will be looked in <code>autobuild.php</code>. You can also run autobuilder from autoload function when class not found, but that may get your program into infinite loop. Serialized arrays are darn fast. @JasonMichael: PHP 4 is dead. Get over it.
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1. POHow to handle including needed classes in PHP
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1. USMichał Rudnicki
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