The definition and function of PHP file cache class

This article mainly introduces the PHP file cache class usage, in the case of the form of a more detailed analysis of the PHP file cache class definition, function and specific use of skills, very practical value, the need for friends can refer to the next

The examples in this article describe the PHP file cache class usage. Specific as follows:

<?php/** * Simple File Cache class * */class xzcache{//default cache time one hour var $cache _time = 3600;//default Cache dir var $cache _dir = './cache '; Public function __construct ($cache _dir=null, $cache _time=null) {$this->cache_dir = isset ($cache _dir)? $cache _dir: $  this->cache_dir; $this->cache_time = isset ($cache _time)? $cache _time: $this->cache_time; The Public Function Savecache ($key, $value) {if (Is_dir ($this->cache_dir)) {$cache _file = $this->cache_dir. '/xzcache_ '.   MD5 ($key);   $timedif = @ (Time ()-Filemtime ($cache _file));    if ($timedif >= $this->cache_time) {//cached file is too old, create new $serialized = Serialize ($value);     if ($f = @fopen ($cache _file, ' W ')) {fwrite ($f, $serialized, strlen ($serialized));    Fclose ($f);  }} $result = 1;   }else{echo "Error:dir is not exist.";  $result = 0; } return $result; }/** * @return array * 0 No Cache * 1 Cached * 2 Overdue * * Public Function GetCache ($key) {$Cache_file = $this->cache_dir. '/xzcache_ '.  MD5 ($key);   if (Is_dir ($this->cache_dir) && is_file ($cache _file)) {$timedif = @ (Time ()-Filemtime ($cache _file));   if ($timedif >= $this->cache_time) {$result [' cached '] = 2; }else{//Cached file is fresh enough, return cached array $result [' value '] = Unserialize (file_get_contents ($cache _f    ile));   $result [' cached '] = 1;   }}else {echo "Error:no cache";  $result [' cached '] = 0; } return $result; }}//end of Class

The usage examples are as follows:

$cache = new Xzcache (); $key = ' global '; $value = $GLOBALS; $cache->savecache ($key, $value); $result = $cache GetCache ($key); Var_dump ($result);

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