Resize a GD image to fit inside a square of the given size. #php

resizeImage.php

<?php
/*******************************************************************************
 ******************************* resizeImage.php *******************************
 *******************************************************************************
 * Resizes a GD image to fit inside a square of the given size.
 ******************************************************************************/
function resize_image($image, $size)
{
	$cur_width = imagesx($image);
	$cur_height = imagesy($image);
	
	if($cur_width < $size and $cur_height < $size)
		return $image;
	
	$width_ratio = $size / $cur_width;
	$height_ratio = $size / $cur_height;
	$ratio = min($width_ratio, $height_ratio);
	
	$new_height = floor($cur_height * $ratio);
	$new_width = floor($cur_width * $ratio);
	
	header("x-resize-to: $new_width x $new_height\n");
	
	return imagescale($image, $new_width, $new_height);
}

?>