Save an image Resized with PHP

Question

I am working on improving my Facebook app. I need to be able to resize an image, then save it to a directory on the server. This is the code I have to resize:

<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;

// Content type
header('Content-type: image/jpeg');

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Output
imagejpeg($image_p, null, 100);
?>

My question is, how would I save this resized image? Would I need to? Is there a way to manipulate the resized image without saving it?

Answer 1

According to the manual on imagejpeg(), the optional second parameter can specify a file name, which it will be written into.

Filename

The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.

To skip this argument in order to provide the quality parameter, use NULL.

It's usually a good idea to write the results to disk for some basic caching, so that not every incoming request leads to a (resource intensive) GD call.