Get("variable_with_id", 60);
if (!$variable) {
// Cache file expired or is inexistant
// Do something to get new data
$cache->Set("variable_with_id", $newdata);
$variable = $newdata;
}
echo $variable;
**/
class cache {
// Where things are cached to (must have trailing slash!)
var $cacheDir = "../cache/phpcache/";
// How long to cache something for in seconds, default 1hr
var $defaultCacheLife = "3600";
function __construct() {
//global $config;
$this->cacheDir = ROOT_PATH . $this->cacheDir;
}
/**
Set($varId, $varValue) --
Creates a file named "cache.VARID.TIMESTAMP"
and fills it with the serialized value from $varValue.
If a cache file with the same varId exists, Delete()
will remove it.
**/
function Set($varId, $varValue) {
global $config;
if ($config ['debug'] == 1) {
add_debug ( "recache: " . $varId . " = " . $varValue );
}
// Clean up old caches with same varId
// $this->Delete($varId);
// Create new file
// $fileHandler = fopen($this->cacheDir . "cache." . $varId . "." . time(), "a");
$file = $this->cacheDir . "cache." . $varId;
//echo $file.'
';
$fileHandler = fopen ( $file, "w" );
// Write serialized data
$s = fwrite ( $fileHandler, serialize ( $varValue ) );
fclose ( $fileHandler );
return $s;
}
/**
Get($varID, $cacheLife) --
Retrives the value inside a cache file
specified by $varID if the expiration time
(specified by $cacheLife) is not over.
If expired, returns FALSE
**/
function Get($varId, $cacheLife = "") {
global $config;
// Set default cache life
//$cacheLife = (! empty ( $cacheLife )) ? $cacheLife : $this->defaultCacheLife;
if ($cacheLife !== false && $cacheLife != '0' && ! is_numeric ( $cacheLife )) {
$cacheLife = $this->defaultCacheLife;
}
if($cacheLife == 0) {
$cacheLife = false;
}
/* Loop through the directory looking for cache file */
/* $dirHandler = dir($this->cacheDir);
while ($file = $dirHandler->read()) {
/* Check for cache file with requested varId * /
if (preg_match("/cache.$varId.[0-9]/", $file)) {
$cacheFileName = explode(".", $file);
// Cache file creation time
$cacheFileLife = $cacheFileName[2];
// Full location
$cacheFile = $this->cacheDir . $file;
/* Check to see if cache file has expired or not * /
if ( $cacheLife == 0 || (time() - $cacheFileLife) <= $cacheLife) {
$fileHandler = fopen($cacheFile, "r");
$varValueResult = fread($fileHandler, filesize($cacheFile));
fclose($fileHandler);
// Still good, return unseralized data
return unserialize($varValueResult);
} else {
// Cache expired, break loop
break;
}
}
}
$dirHandler->close();
*/
$file = $this->cacheDir . "cache." . $varId;
//echo '
';
if (file_exists ( $file ) && filesize ( $file ) > 0) {
if ($cacheLife === false || (time () - filemtime ( $file )) <= $cacheLife) {
$fileHandler = fopen ( $file, "r" );
$varValueResult = fread ( $fileHandler, filesize ( $file ) );
fclose ( $fileHandler );
// Still good, return unseralized data
return unserialize ( $varValueResult );
} else {
if ($config ['debug'] == 1) {
//add_debug ( "cache expire: " . $varId . " TimeExpire: " . unix_time ( filectime ( $file ) ) );
}
return false;
}
} else {
if ($config ['debug'] == 1) {
add_debug ( "cache file not exists! " . $varId );
}
return false;
}
return FALSE;
}
/**
Delete($varId) --
Loops through the cache directory and
removes any cache files with the varId
specified in $varID
**/
function Delete($varId) {
/*$dirHandler = dir($this->cacheDir);
while ($file = $dirHandler->read()) {
if (preg_match("/cache.$varId.[0-9]/", $file)) {
unlink($this->cacheDir . $file); // Delete cache file
}
}
$dirHandler->close();
*/
$file = $this->cacheDir . "cache." . $varId;
if (file_exists ( $file )) {
unlink ( $file );
return true;
}
return false;
}
}
?>