wp-super-minify / includes / min / lib / Minify / Cache / APC.php

APC.php in WP Super Minify • Minify, Compress and Cache HTML, CSS & JavaScript trunk, at includes/min/lib/Minify/Cache/APC.php

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1	<?php
2	/**
3	* Class Minify_Cache_APC
4	* @package Minify
5	*/
6
7	/**
8	* APC-based cache class for Minify
9	*
10	* <code>
11	* Minify::setCache(new Minify_Cache_APC());
12	* </code>
13	*
14	* @package Minify
15	* @author Chris Edwards
16	*
17	* @deprecated Use Minify_Cache_APCu
18	**/
19	class Minify_Cache_APC implements Minify_CacheInterface
20	{
21
22	/**
23	* Create a Minify_Cache_APC object, to be passed to
24	* Minify::setCache().
25	*
26	*
27	* @param int $expire seconds until expiration (default = 0
28	* meaning the item will not get an expiration date)
29	*
30	* @return null
31	*/
32	public function __construct($expire = 0)
33	{
34	$this->_exp = $expire;
35	}
36
37	/**
38	* Write data to cache.
39	*
40	* @param string $id cache id
41	*
42	* @param string $data
43	*
44	* @return bool success
45	*/
46	public function store($id, $data)
47	{
48	return apc_store($id, "{$_SERVER['REQUEST_TIME']}\|{$data}", $this->_exp);
49	}
50
51	/**
52	* Get the size of a cache entry
53	*
54	* @param string $id cache id
55	*
56	* @return int size in bytes
57	*/
58	public function getSize($id)
59	{
60	if (! $this->_fetch($id)) {
61	return false;
62	}
63
64	if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
65	return mb_strlen($this->_data, '8bit');
66	} else {
67	return strlen($this->_data);
68	}
69	}
70
71	/**
72	* Does a valid cache entry exist?
73	*
74	* @param string $id cache id
75	*
76	* @param int $srcMtime mtime of the original source file(s)
77	*
78	* @return bool exists
79	*/
80	public function isValid($id, $srcMtime)
81	{
82	return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
83	}
84
85	/**
86	* Send the cached content to output
87	*
88	* @param string $id cache id
89	*/
90	public function display($id)
91	{
92	echo $this->_fetch($id) ? $this->_data : '';
93	}
94
95	/**
96	* Fetch the cached content
97	*
98	* @param string $id cache id
99	*
100	* @return string
101	*/
102	public function fetch($id)
103	{
104	return $this->_fetch($id) ? $this->_data : '';
105	}
106
107	private $_exp = null;
108
109	// cache of most recently fetched id
110	private $_lm = null;
111	private $_data = null;
112	private $_id = null;
113
114	/**
115	* Fetch data and timestamp from apc, store in instance
116	*
117	* @param string $id
118	*
119	* @return bool success
120	*/
121	private function _fetch($id)
122	{
123	if ($this->_id === $id) {
124	return true;
125	}
126	$ret = apc_fetch($id);
127	if (false === $ret) {
128	$this->_id = null;
129
130	return false;
131	}
132
133	list($this->_lm, $this->_data) = explode('\|', $ret, 2);
134	$this->_id = $id;
135
136	return true;
137	}
138	}
139