PHP File Cache Usage instance analysis

PHP File Cache Usage instance analysis

This article mainly introduces the usage of PHP File Cache class, and analyzes in detail the definition, functions, and specific usage skills of PHP File Cache class in the form of instances, which is of great practical value, for more information, see

This example describes the usage of the PHP File Cache class. Share it with you for your reference. The details are as follows:

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<? 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; } 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_file )); $ Result ['cached'] = 1; } } Else { Echo "Error: no cache "; $ Result ['cached'] = 0; } Return $ result; } } // End of class

Example:

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$ Cache = new XZCache (); $ Key = 'global '; $ Value = $ GLOBALS; $ Cache-> saveCache ($ key, $ value ); $ Result = $ cache-> getCache ($ key ); Var_dump ($ result );

I hope this article will help you with php programming.