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

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

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