以文件形式缓存php变量的方法_PHP教程
以文件形式缓存php变量的方法
本文实例讲述了以文件形式缓存php变量的方法。分享给大家供大家参考。具体实现方法如下：
?
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 |
/* $cache_set = array( //缓存路径 , 最后要加"/" 'cacheRoot'=>'./cache/', //缓存时间 'cacheTime'=>20, //cache type 'cacheType'=>1, //扩展名 'cacheExe'=>'.php' ); $cache = new Cache($cache_set); $a=array('1','2'); $a="aaa"; $b=''; if($cache->cache_is("d")){ $c=$cache->cache_read("d"); echo "c"; print_r($c); }else { $b=$cache->cache_data('d',$a); } print_r($b); //$cache->clear("a"); //echo $cache->cache_read("./cache/d.php"); //echo $d; */ /** * 数据缓存类 v1.0 * @author shooke * 2009-11-13 16:02:26 * 用于缓存数据,如变量,但不能缓存页面 */ class Cache{ //配置 public $config = array( //缓存路径 'cacheRoot'=>'./cache/', //缓存时间 'cacheTime'=>1, //cache 类型 1串化数据 2变量 'cacheType'=>2, //扩展名 'cacheExe'=>'.php' //转换中间变量 ); public $return_name=array(); function __construct($cache_set = array()) { if(!empty($cache_set)) $this->config=array_merge($this->config,$cache_set); $this->config['ClassName'] = __CLASS__; } public function clear($filename=''){ if (file_exists($this->cache_file($filename))) { @unlink($this->cache_file($filename)); }elseif (empty($filename)){ $this->clear_dir($this->config['cacheRoot']); }else{ $this->clear_dir($this->config['cacheRoot'].$filename); echo $this->config['cacheRoot'].$filename; } } //循环删除路径 private function clear_dir($dir,$to = false) { if ($list = glob($dir.'/*')) { foreach ($list as $file) { is_dir($file) ? $this->clear_dir($file) : unlink($file); } } if ($to === false) rmdir($dir); } //写入缓存 private function cache_write($filename, $writetext, $openmod='w'){ if (!file_exists($filename)) { @$this->makeDir( dirname($filename )); } if(@$fp = fopen($filename, $openmod)) { flock($fp, 2); fwrite($fp, $writetext); fclose($fp); return true; } else { echo "File: $filename write error."; return false; } } //缓存有效期 有效返回 true public function cache_is($fileName){ $fileName=$this->cache_file($fileName); if( file_exists( $fileName ) ) { //如果缓存时间为负数则永不过期 if ($this->config['cacheTime'] return true; } //如果缓存时间为0则一直过期 if ($this->config['cacheTime'] == 0) { return false; } //获取缓存文件的建立时间 $ctime = intval(filemtime( $fileName )); //比较是否大于缓存时间,是则过期 否则不过期 if (time() - $ctime > $this->config['cacheTime']) { return false; }else { return true; } //文件不存在视为过期失效 }else { return false; } } public function cache_data($name,$data){ $varname=$name; $name = $this->cache_file($name); //config['cacheTime']==0也就是不启用缓存是直接返回数据 if ($this->config['cacheTime'] 0) { if($this->config['cacheType']==1){ $write_data = "".serialize($data); //return $data; }else { $write_data = " $write_data .= var_export($data,true); $write_data .=";\\r\\n?>"; } $this->cache_write($name,$write_data); } return $data; } //缓存文件名 private function cache_file($filename){ return $this->config['cacheRoot'].$filename.$this->config['cacheExe']; } //读取文件 public function cache_read($file){ $file=$this->cache_file($file); if (!file_exists($file)) { return ''; } if($this->config['cacheType']==1){ if (function_exists('file_get_contents')){ $cache_Content= file_get_contents($file); }else{ $fopen = fopen($file,'r'); $cache_Content = ''; do { $data = fread($fopen,filesize($file)); if (strlen($data)===0) break; $cache_Content .= $data; }while(1); fclose($fopen); } $cache_Content = substr($cache_Content,13);/* 去除 */ $cache_Content = unserialize($cache_Content); return $cache_Content; }else{ include_once($file); return $var; } } //循环创建目录 private function makeDir( $dir, $mode = 0777 ) { if( ! $dir ) return 0; $dir = str_replace( "\\\\", "/", $dir ); $mdir = ""; foreach( explode( "/", $dir ) as $val ) { $mdir .= $val."/"; if( $val == ".." || $val == "." || trim( $val ) == "" ) continue; if( ! file_exists( $mdir ) ) { if(!@mkdir( $mdir, $mode )){ return false; } } } return true; } } ?> |
希望本文所述对大家的php程序设计有所帮助。