Output.php

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


class Zend_Cache_Frontend_Output extends Zend_Cache_Core
{

    private $_idStack = array();

    public function __construct(array $options = array())
    {
        parent::__construct($options);
        $this->_idStack = array();
    }

    public function start($id, $doNotTestCacheValidity = false, $echoData = true)
    {
        $data = $this->load($id, $doNotTestCacheValidity);
        if ($data !== false) {
            if ( $echoData ) {
                echo($data);
                return true;
            } else {
                return $data;
            }
        }
        ob_start();
        ob_implicit_flush(false);
        $this->_idStack[] = $id;
        return false;
    }

    public function end($tags = array(), $specificLifetime = false, $forcedDatas = null, $echoData = true, $priority = 8)
    {
        if ($forcedDatas === null) {
            $data = ob_get_clean();
        } else {
            $data =& $forcedDatas;
        }
        $id = array_pop($this->_idStack);
        if ($id === null) {
            Zend_Cache::throwException('use of end() without a start()');
        }
        $this->save($data, $id, $tags, $specificLifetime, $priority);
        if ($echoData) {
            echo($data);
        }
    }

}