File.php

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<?php
#require_once 'Zend/Cache/Core.php';


class Zend_Cache_Frontend_File extends Zend_Cache_Core
{

    const MODE_AND = 'AND';
    const MODE_OR  = 'OR';

    protected $_specificOptions = array(
        'master_file' => null,
        'master_files' => null,
        'master_files_mode' => 'OR',
        'ignore_missing_master_files' => false
    );

    private $_masterFile_mtimes = null;

    public function __construct(array $options = array())
    {
        foreach ($options as $name => $value) {
            $this->setOption($name, $value);
        }
        if (!isset($this->_specificOptions['master_files'])) {
            Zend_Cache::throwException('master_files option must be set');
        }
    }

    public function setMasterFiles(array $masterFiles)
    {
        $this->_specificOptions['master_file']  = null; // to keep a compatibility
        $this->_specificOptions['master_files'] = null;
        $this->_masterFile_mtimes = array();

        clearstatcache();
        $i = 0;
        foreach ($masterFiles as $masterFile) {
            if (file_exists($masterFile)) {
                $mtime = filemtime($masterFile);
            } else {
                $mtime = false;
            }

            if (!$this->_specificOptions['ignore_missing_master_files'] && !$mtime) {
                Zend_Cache::throwException('Unable to read master_file : ' . $masterFile);
            }

            $this->_masterFile_mtimes[$i] = $mtime;
            $this->_specificOptions['master_files'][$i] = $masterFile;
            if ($i === 0) { // to keep a compatibility
                $this->_specificOptions['master_file'] = $masterFile;
            }

            $i++;
        }
    }

    public function setMasterFile($masterFile)
    {
          $this->setMasterFiles(array($masterFile));
    }

    public function setOption($name, $value)
    {
        if ($name == 'master_file') {
            $this->setMasterFile($value);
        } else if ($name == 'master_files') {
            $this->setMasterFiles($value);
        } else {
            parent::setOption($name, $value);
        }
    }

    public function load($id, $doNotTestCacheValidity = false, $doNotUnserialize = false)
    {
        if (!$doNotTestCacheValidity) {
            if ($this->test($id)) {
                return parent::load($id, true, $doNotUnserialize);
            }
            return false;
        }
        return parent::load($id, true, $doNotUnserialize);
    }

    public function test($id)
    {
        $lastModified = parent::test($id);
        if ($lastModified) {
            if ($this->_specificOptions['master_files_mode'] == self::MODE_AND) {
                // MODE_AND
                foreach($this->_masterFile_mtimes as $masterFileMTime) {
                    if ($masterFileMTime) {
                        if ($lastModified > $masterFileMTime) {
                            return $lastModified;
                        }
                    }
                }
            } else {
                // MODE_OR
                $res = true;
                foreach($this->_masterFile_mtimes as $masterFileMTime) {
                    if ($masterFileMTime) {
                        if ($lastModified <= $masterFileMTime) {
                            return false;
                        }
                    }
                }
                return $lastModified;
            }
        }
        return false;
    }

}