本文實例講述了以文件形式緩存php變量的方法。分享給大家供大家參考。具體實現方法如下：
? 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 <?php /* $cache_set = array( //緩存路徑 , 最後要加"/" 'cacheRoot'=>'./cache/', //緩存時間 'cacheTime'=>20, //cache type 'cacheType'=>1, //擴展名 '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; */ /** * 數據緩存類 v1.0 * @author shooke * 2009-11-13 16:02:26 * 用於緩存數據,如變量,但不能緩存頁面 */ class Cache{ //配置 public $config = array( //緩存路徑 'cacheRoot'=>'./cache/', //緩存時間 'cacheTime'=>1, //cache 類型 1串化數據 2變量 'cacheType'=>2, //擴展名 'cacheExe'=>'.php' //轉換中間變量 ); 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; } } //循環刪除路徑 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($dir); } //寫入緩存 private function cache_write($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: $filename write error."; return false; } } //緩存有效期 有效返回 true public function cache_is($fileName){ $fileName=$this->cache_file($fileName); if( file_exists( $fileName ) ) { //如果緩存時間為負數則永不過期 if ($this->config['cacheTime'] < 0) { return true; } //如果緩存時間為0則一直過期 if ($this->config['cacheTime'] == 0) { return false; } //獲取緩存文件的建立時間 $ctime = intval(filemtime( $fileName )); //比較是否大於緩存時間,是則過期 否則不過期 if (time() - $ctime > $this->config['cacheTime']) { return false; }else { return true; } //文件不存在視為過期失效 }else { return false; } } public function cache_data($name,$data){ $varname=$name; $name = $this->cache_file($name); //config['cacheTime']==0也就是不啟用緩存是直接返回數據 if ($this->config['cacheTime'] <> 0) { if($this->config['cacheType']==1){ $write_data = "<?php exit;?>".serialize($data); //return $data; }else { $write_data = "<?phprn$var= "; $write_data .= var_export($data,true); $write_data .=";rn?>"; } $this->cache_write($name,$write_data); } return $data; } //緩存文件名 private function cache_file($filename){ return $this->config['cacheRoot'].$filename.$this->config['cacheExe']; } //讀取文件 public function cache_read($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<?php exit;?> */ $cache_Content = unserialize($cache_Content); return $cache_Content; }else{ include_once($file); return $var; } } //循環創建目錄 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; } } ?>希望本文所述對大家的php程序設計有所幫助。
