cache di immagini dinamiche

[ptransidico]

Come si puo fare la cache di immagini create attraverso le libreruie GD?
Qualche suggerimento?

ciao

[ptransidico]

qualcuno mi puo dare una mano

$page_id = $image;
$timeout = 60000;
$path = "./chached/".$page_id;

if(!file_exists("./chached /"))
mkdir("./chached /");

if(file_exists($path) and filemtime($path) + $timeout > time()) {
$result = readfile($path);
if($result)
exit();
}

set_time_limit(0);
ob_start();


// all seems to be OK so start the processing
// create the new image using the tnsize parameter
$tnimage = ImageCreateTrueColor($tnsize, $tnsize);
// allocate the background colour for the thumbnail
$darkblue = ImageColorAllocate($tnimage, 0, 0, 127);
// set the background as transparent
ImageColorTransparent($tnimage,$darkblue);
// get the parameters of the big image
$sz = GetImageSize($image);
// load our internal variables
$x = $sz[0]; // big image width
$y = $sz[1]; // big image height
// find the larger dimension
if ($x>$y) { // if it is the width then
$dx = 0; // the left side of the new image
$w = $tnsize; // the width of the new image
$h = ($y / $x) * $tnsize; // the height of the new image
$dy = ($tnsize - $h) / 2; // the top of the new image
}else{ // if the height is larger then
$dy = 0; // the top of the new image
$h = $tnsize; // the height of the new image
$w = ($x / $y) * $tnsize; // the width of the new image
$dx = ($tnsize - $w) / 2; // the left edgeof the new image
}

// copy the resized version into the thumbnal image
ImageCopyResized($tnimage, $bigimage, $dx, $dy, 0, 0, $w, $h, $x, $y);
// generate the Gif image
ImageJpeg($tnimage);

$output = ob_get_flush();

$fp = fopen($path, "w");
fwrite($fp, $output, strlen($output));
fclose($fp);

// release the memory used by the thumbnail image
//ImageDestroy($tnimage);
// release the memory used by the original big image
//ImageDestroy($bigimage);
// all done!
?>