PHP Salt

	$str = psFileCache("http://www.google.com","/tmp/google.cache");

// returns a cache file, expires in seconds, default is 10
function psFileCache($wURL, $cFile, $cTime=10)
{
	// does the cache file exists
	$expired = "y";

    $cache = array();
	if (file_exists($cFile) == true)
	  {
	  //print "** Exists **";
	  $cache = unserialize(psFileGetContents($cFile));
	  // is it expired?
	  $now = time();
	  $expTime = $cache['ts'] + $cTime;
	  if ( $expTime  > $now )
	    {
	    $expired = "n";
	    }
	  }

	//print "Expired ($cTime): $expired [$expTime / $now]";

	// at this point, if expired = y, we need fetch it
	if ($expired == "y")
	  {
	  $cache['ts'] = time();
	  $cache['data'] = psFileGetContents($wURL);
	  file_put_contents($cFile,serialize($cache));
	  }

	return $cache['data'];
}