PHP Classes

File: cache.inc

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File: cache.inc
Role: ???
Content type: text/plain
Description: Cache Class
Class: cache
Author: By
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Date: 23 years ago
Size: 2,681 bytes
 

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<?PHP // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- // // Package : cache Version : 1.2 // Date : 04/20/2001 Author : Shaun Thomas // Req : PHP 3.0 Type : Class // // Description: // ------------ // Caching should be a "behind the scenes" kind of thing. So, this // class was designed to handle all caching abilities, whether it be // through file or database. The user of the cacheing system need // not know. // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- // class CCache { var $cachePath, // Path to save or load the cache from. $fileName, // Filename we'll generate for all save/loads. $expire; // When cache pages should be recalculated. (in seconds) // -------------------------------------------------- // // A constructor sets up our cache environment so // we can start shuffling files around. All we need // is a path to save/retrieve files at/from. // -------------------------------------------------- // function CCache($cPath) { global $QUERY_STRING, $SCRIPT_NAME; $this->cachePath = $cPath; // Generate a filename based on this script's name, // and query string. $this->fileName=base64_encode($SCRIPT_NAME.$QUERY_STRING); } // End function CCache. // -------------------------------------------------- // // Saves whatever is sent to this function, to the // generated filename for this script. // -------------------------------------------------- // function save(&$contents) { $fp = fopen($this->cachePath."/".$this->fileName, "w"); if (!$fp) return; fwrite($fp, $contents); fclose($fp); } // End function save. // -------------------------------------------------- // // Of course, we need some way of getting a cached // file. This returns false if there is no file. // -------------------------------------------------- // function retrieve() { $fName = $this->cachePath."/".$this->fileName; // If there is no cache page, or the page is expired, tell // the caller to recalculate it. if (!file_exists($fName)) return FALSE; if (filemtime($fName) < (time() - $this->expire)) return FALSE; $fp = fopen($fName, "r"); if (!$fp) return FALSE; $retVal = fread($fp, filesize($fName)); fclose($fp); return $retVal; } // End function retrieve. } // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- // // End cache class // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- // ?>