silverstripe-framework/Core/Manifest/ManifestCache_File.php

<?php

namespace SilverStripe\Core\Manifest;

/**
 * Stores manifest data in files in TEMP_DIR dir on filesystem
 */
class ManifestCache_File implements ManifestCache
{

	protected $folder = null;

	function __construct($name)
	{
		$this->folder = TEMP_FOLDER . '/' . $name;
		if (!is_dir($this->folder)) {
			mkdir($this->folder);
		}
	}

	function load($key)
	{
		$file = $this->folder . '/cache_' . $key;
		return file_exists($file) ? unserialize(file_get_contents($file)) : null;
	}

	function save($data, $key)
	{
		$file = $this->folder . '/cache_' . $key;
		file_put_contents($file, serialize($data));
	}

	function clear()
	{
		array_map('unlink', glob($this->folder . '/cache_*'));
	}
}