How to cache php variables in file form_PHP Tutorial

How to cache php variables in the form of files

This example describes how to cache php variables in the form of files. Share it with everyone for your reference. The specific implementation method is as follows:

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/* $cache_set = array( //Cache path, add "/" at the end 'cacheRoot'=>'./cache/', //Cache time 'cacheTime'=>20, //cache type 'cacheType'=>1, //Extension '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; */ /** * Data cache class v1.0 * @author shooke * 2009-11-13 16:02:26 * Used to cache data, such as variables, but cannot cache pages */ class Cache{ //Configuration public $config = array( //Cache path 'cacheRoot'=>'./cache/', //Cache time 'cacheTime'=>1, //cache type 1 serialized data 2 variables 'cacheType'=>2, //Extension 'cacheExe'=>'.php' //Convert intermediate variables ); 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; } } //Loop deletion path 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($dir); } //Write cache private function cache_write($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: $filename write error."; return false; } } //The cache validity period is valid and returns true public function cache_is($fileName){ $fileName=$this->cache_file($fileName); if( file_exists( $fileName ) ) { //If the cache time is a negative number, it will never expire if ($this->config['cacheTime'] < 0) { return true; } //If the cache time is 0, it will always expire if ($this->config['cacheTime'] == 0) { return false; } //Get the creation time of the cache file $ctime = intval(filemtime( $fileName )); //Compare whether it is greater than the cache time, if so, it will expire, otherwise it will not expire if (time() - $ctime > $this->config['cacheTime']) { return false; }else { return true; } //The file does not exist and is considered expired }else { return false; } } public function cache_data($name,$data){ $varname=$name; $name = $this->cache_file($name); //config['cacheTime']==0 means that caching is not enabled and data is returned directly 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; } } ?>

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