wp-optimize / vendor / mrclay / minify / lib / Minify / Cache / ZendPlatform.php

ZendPlatform.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.2.3, at vendor/mrclay/minify/lib/Minify/Cache/ZendPlatform.php

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1	<?php
2	/**
3	* Class Minify_Cache_ZendPlatform
4	* @package Minify
5	*/
6
7	/**
8	* ZendPlatform-based cache class for Minify
9	*
10	* Based on Minify_Cache_APC, uses output_cache_get/put (currently deprecated)
11	*
12	* <code>
13	* Minify::setCache(new Minify_Cache_ZendPlatform());
14	* </code>
15	*
16	* @package Minify
17	* @author Patrick van Dissel
18	*/
19	class Minify_Cache_ZendPlatform implements Minify_CacheInterface
20	{
21
22	/**
23	* Create a Minify_Cache_ZendPlatform object, to be passed to
24	* Minify::setCache().
25	*
26	* @param int $expire seconds until expiration (default = 0
27	* meaning the item will not get an expiration date)
28	*
29	*/
30	public function __construct($expire = 0)
31	{
32	$this->_exp = $expire;
33	}
34
35	/**
36	* Write data to cache.
37	*
38	* @param string $id cache id
39	*
40	* @param string $data
41	*
42	* @return bool success
43	*/
44	public function store($id, $data)
45	{
46	return output_cache_put($id, "{$_SERVER['REQUEST_TIME']}\|{$data}");
47	}
48
49	/**
50	* Get the size of a cache entry
51	*
52	* @param string $id cache id
53	*
54	* @return int size in bytes
55	*/
56	public function getSize($id)
57	{
58	return $this->_fetch($id) ? strlen($this->_data) : false;
59	}
60
61	/**
62	* Does a valid cache entry exist?
63	*
64	* @param string $id cache id
65	*
66	* @param int $srcMtime mtime of the original source file(s)
67	*
68	* @return bool exists
69	*/
70	public function isValid($id, $srcMtime)
71	{
72	return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
73	}
74
75	/**
76	* Send the cached content to output
77	*
78	* @param string $id cache id
79	*/
80	public function display($id)
81	{
82	echo $this->_fetch($id) ? $this->_data : '';
83	}
84
85	/**
86	* Fetch the cached content
87	*
88	* @param string $id cache id
89	*
90	* @return string
91	*/
92	public function fetch($id)
93	{
94	return $this->_fetch($id) ? $this->_data : '';
95	}
96
97	private $_exp = null;
98
99	// cache of most recently fetched id
100	private $_lm = null;
101	private $_data = null;
102	private $_id = null;
103
104	/**
105	* Fetch data and timestamp from ZendPlatform, store in instance
106	*
107	* @param string $id
108	*
109	* @return bool success
110	*/
111	private function _fetch($id)
112	{
113	if ($this->_id === $id) {
114	return true;
115	}
116
117	$ret = output_cache_get($id, $this->_exp);
118	if (false === $ret) {
119	$this->_id = null;
120
121	return false;
122	}
123
124	list($this->_lm, $this->_data) = explode('\|', $ret, 2);
125	$this->_id = $id;
126
127	return true;
128	}
129	}
130