ClassCollectionLoader.php
public static function load($classes, $cacheDir, $name, $autoReload, $adaptive = false, $extension = '.php')
    {
        // each $name can only be loaded once per PHP process
        if (isset(self::$loaded[$name])) {
            return;
        }

        self::$loaded[$name] = true;

        if ($adaptive) {
            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());

            // don't include already declared classes
            $classes = array_diff($classes, $declared);

            // the cache is different depending on which classes are already declared
            $name = $name.'-'.substr(hash('sha256', implode('|', $classes)), 0, 5);
        }

        $classes = array_unique($classes);

        // cache the core classes
        if (!is_dir($cacheDir) && !@mkdir($cacheDir, 0777, true) && !is_dir($cacheDir)) {
            throw new \RuntimeException(sprintf('Class Collection Loader was not able to create directory "%s"', $cacheDir));
        }
        $cacheDir = rtrim(realpath($cacheDir) ?: $cacheDir, '/'.DIRECTORY_SEPARATOR);
        $cache = $cacheDir.'/'.$name.$extension;

        // auto-reload
        $reload = false;
        if ($autoReload) {
            $metadata = $cache.'.meta';
            if (!is_file($metadata) || !is_file($cache)) {
                $reload = true;
            } else {
                $time = filemtime($cache);
                $meta = unserialize(file_get_contents($metadata));

                sort($meta[1]);
                sort($classes);

                if ($meta[1] != $classes) {
                    $reload = true;
                } else {
                    foreach ($meta[0] as $resource) {
                        if (!is_file($resource) || filemtime($resource) > $time) {
                            $reload = true;

                            break;
                        }
                    }
                }
            }
        }

        if (!$reload && file_exists($cache)) {
            require_once $cache;

            return;
        }
        if (!$adaptive) {
            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());
        }

        $files = self::inline($classes, $cache, $declared);

        if ($autoReload) {
            // save the resources
            self::writeCacheFile($metadata, serialize(array(array_values($files), $classes)));
        }
    }
public static function load($classes, $cacheDir, $name, $autoReload, $adaptive = false, $extension = '.php')
    {
        // each $name can only be loaded once per PHP process
        if (isset(self::$loaded[$name])) {
            return;
        }

        self::$loaded[$name] = true;

        if ($adaptive) {
            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());

            // don't include already declared classes
            $classes = array_diff($classes, $declared);

            // the cache is different depending on which classes are already declared
            $name = $name.'-'.substr(hash('sha256', implode('|', $classes)), 0, 5);
        }

        $classes = array_unique($classes);

        // cache the core classes
        if (!is_dir($cacheDir) && !@mkdir($cacheDir, 0777, true) && !is_dir($cacheDir)) {
            throw new \RuntimeException(sprintf('Class Collection Loader was not able to create directory "%s"', $cacheDir));
        }
        $cacheDir = rtrim(realpath($cacheDir) ?: $cacheDir, '/'.DIRECTORY_SEPARATOR);
        $cache = $cacheDir.'/'.$name.$extension;

        // auto-reload
        $reload = false;
        if ($autoReload) {
            $metadata = $cache.'.meta';
            if (!is_file($metadata) || !is_file($cache)) {
                $reload = true;
            } else {
                $time = filemtime($cache);
                $meta = unserialize(file_get_contents($metadata));

                sort($meta[1]);
                sort($classes);

                if ($meta[1] != $classes) {
                    $reload = true;
                } else {
                    foreach ($meta[0] as $resource) {
                        if (!is_file($resource) || filemtime($resource) > $time) {
                            $reload = true;

                            break;
                        }
                    }
                }
            }
        }

        if (!$reload && file_exists($cache)) {
            require_once $cache;

            return;
        }
        if (!$adaptive) {
            $declared = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());
        }

        $files = self::inline($classes, $cache, $declared);

        if ($autoReload) {
            // save the resources
            self::writeCacheFile($metadata, serialize(array(array_values($files), $classes)));
        }
    }
Loads a list of classes and caches them in one big file.

@param array  $classes    An array of classes to load
@param string $cacheDir   A cache directory
@param string $name       The cache name prefix
@param bool   $autoReload Whether to flush the cache when the cache is stale or not
@param bool   $adaptive   Whether to remove already declared classes or not
@param string $extension  File extension of the resulting file

@throws \InvalidArgumentException When class can't be loaded