以檔案形式緩衝php變數的方法，_PHP教程

以檔案形式緩衝php變數的方法，

本文執行個體講述了以檔案形式緩衝php變數的方法。分享給大家供大家參考。具體實現方法如下：

<?php/*$cache_set = array(//緩衝路徑 , 最後要加"/"'cacheRoot'=>'./cache/',//緩衝時間'cacheTime'=>20,//cache type'cacheType'=>1,//副檔名'cacheExe'=>'.php');$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;*//** * 資料緩衝類 v1.0 * @author shooke * 2009-11-13 16:02:26 * 用於快取資料,如變數,但不能快取頁面面 */class Cache{ //配置 public $config = array( //緩衝路徑 'cacheRoot'=>'./cache/', //緩衝時間 'cacheTime'=>1, //cache 類型 1串化資料 2變數 'cacheType'=>2, //副檔名 'cacheExe'=>'.php' //轉換中間變數 ); 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;  } } //迴圈刪除路徑 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($dir); } //寫入緩衝 private function cache_write($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: $filename write error.";   return false;  } } //緩衝有效期間 有效返回 true public function cache_is($fileName){  $fileName=$this->cache_file($fileName);  if( file_exists( $fileName ) ) {   //如果緩衝時間為負數則永不到期   if ($this->config['cacheTime'] < 0) {    return true;   }   //如果緩衝時間為0則一直到期   if ($this->config['cacheTime'] == 0) {    return false;   }   //擷取快取檔案的建立時間   $ctime = intval(filemtime( $fileName ));   //比較是否大於緩衝時間,是則到期 否則不到期   if (time() - $ctime > $this->config['cacheTime']) {    return false;   }else {    return true;   }   //檔案不存在視為到期失效  }else {   return false;  } } public function cache_data($name,$data){  $varname=$name;  $name = $this->cache_file($name);  //config['cacheTime']==0也就是不啟用緩衝是直接返回資料  if ($this->config['cacheTime'] <> 0) {   if($this->config['cacheType']==1){    $write_data = "<?php exit;?>".serialize($data);    //return $data;   }else {    $write_data = "<?php\\r\\n\\$var= ";    $write_data .= var_export($data,true);    $write_data .=";\\r\\n?>";   }   $this->cache_write($name,$write_data);  }  return $data; } //快取檔案名 private function cache_file($filename){  return $this->config['cacheRoot'].$filename.$this->config['cacheExe']; } //讀取檔案 public function cache_read($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;  } } //迴圈建立目錄 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程式設計有所協助。

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