php+redis缓存类

php+redis缓存类

2. class redisCache {
3. /**
4. * $host : redis服务器ip
5. * $port : redis服务器端口
6. * $lifetime : 缓存文件有效期,单位为秒
7. * $cacheid : 缓存文件路径,包含文件名
8. */
9. private $host;
10. private $port;
11. private $lifetime;
12. private $cacheid;
13. private $data;
14. public $redis;
15. /**
16. * 析构函数,检查缓存目录是否有效,默认赋值
17. */
18. function __construct($lifetime=1800) {
19. //配置
20. $this->host = "127.0.0.1";
21. $this->port = "6379";
22. $redis = new Redis();
23. $redis->pconnect($this->host,$this->port);
24. $this->redis=$redis;
25. $this->cacheid = $this->getcacheid();
26. $this->lifetime = $lifetime;
27. $this->data=$redis->hMGet($this->cacheid, array('content','creattime'));
28. //print_r($this->redis);
29. //print_r($this->data);
30. }
33. /**
34. * 检查缓存是否有效
35. */
36. private function isvalid(){
37. $data=$this->data;
38. if (!$data['content']) return false;
39. if (time() - $data['creattime'] > $this->lifetime) return false;
40. return true;
41. }
42. /**
43. * 写入缓存
44. * $mode == 0 , 以浏览器缓存的方式取得页面内容
45. */
46. public function write($mode=0,$content='') {
47. switch ($mode) {
48. case 0:
49. $content = ob_get_contents();
50. break;
51. default:
52. break;
53. }
54. ob_end_flush();
55. try {
56. $this->redis->hMset($this->cacheid, array('content'=>$content,'creattime'=>time()));
57. $this->redis->expireAt($this->cacheid, time() + $this->lifetime);
58. }
59. catch (Exception $e) {
60. $this->error('写入缓存失败!');
61. }
62. }
63. /**
64. * 加载缓存
65. * exit() 载入缓存后终止原页面程序的执行,缓存无效则运行原页面程序生成缓存
66. * ob_start() 开启浏览器缓存用于在页面结尾处取得页面内容
67. */
68. public function load() {
69. if ($this->isvalid()) {
70. echo $this->data['content'];
71. exit();
72. }
73. else {
74. ob_start();
75. }
76. }
77. /**
78. * 清除缓存
79. */
80. public function clean() {
81. try {
82. $this->redis->hDel($this->cacheid, array('content','creattime'));
83. }
84. catch (Exception $e) {
85. $this->error('清除缓存失败!');
86. }
87. }
88. /**
89. * 取得缓存文件路径
90. */
91. private function getcacheid() {
92. return $this->dir.md5($this->geturl()).$this->ext;
93. }
94. /**
95. * 取得当前页面完整url
96. */
97. private function geturl() {
98. $url = '';
99. if (isset($_SERVER['REQUEST_URI'])) {
100. $url = $_SERVER['REQUEST_URI'];
101. }
102. else {
103. $url = $_SERVER['Php_SELF'];
104. $url .= empty($_SERVER['QUERY_STRING'])?'':'?'.$_SERVER['QUERY_STRING'];
105. }
106. return $url;
107. }
108. /**
109. * 输出错误信息
110. */
111. private function error($str) {
112. echo '
     '.$str.'
     ';
113. }
114. }
117. //用法：
118. // require_once('redisCache.php');
119. // $cache = new redisCache(10); //设置缓存生存期
120. // if ($_GET['clearCache']) $cache->clean();
121. // else $cache->load(); //装载缓存,缓存有效则不执行以下页面代码
122. // //页面代码开始
124. // //页面代码结束
125. // $cache->write(); //首次运行或缓存过期,生成缓存
129. ?>

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php, redis

本主题由 小贝 于 2015-11-12 08:43 移动