thumb.php

<?php
$i = isset($_GET['f']) ? $_GET['f'] : "";//$yok;
$x = isset($_GET['w']) ? intval($_GET['w']) : 100;
$y = isset($_GET['h']) ? intval($_GET['h']) : 0;

$noimage = false;
if (is_file($i))
{
	list($w, $h, $t) = getimagesize($i);
	if (in_array($t, array(1, 2, 3))) {
		if($y==0)
		{
			$y = (int)($x * $h / $w);
		}
		if (($w / $h) >= ($x / $y)) {
			$b = ceil($x * $h / $w);
			$a = ceil($w * $b / $h);
		} else {
			$a = ceil($w * $y / $h);
			$b = ceil($a * $h / $w);
		}
		$bx = ceil(($y - $b) / 2);
		$ax = ceil(($x - $a) / 2);
				
		$source = imagecreate($w, $h);
		switch ($t) {
			case 1:
				$source = imagecreatefromgif($i);
				break;
			case 2:
				$source = imagecreatefromjpeg($i);
				break;
			case 3:
				$source = imagecreatefrompng($i);
				break;
		}		
	}else{
		$noimage = true;
	}
}else{
	$noimage = true;
}

$thumb = imagecreatetruecolor($x, $y);
imagealphablending($thumb, false);
$alpha = imagecolorallocatealpha($thumb, 0, 0, 0, 127);
imagefill($thumb, 0, 0, $alpha);
imagesavealpha($thumb, true);
		
if($noimage==false)
{
	imagecopyresampled($thumb, $source, $ax, $bx, 0, 0, $a, $b, $w, $h);
}else{
	$color = imagecolorallocate($thumb, 200, 200, 200);
	for($i=0;$i<5;$i++)
	imageellipse($thumb, $x/2, $y/2, $x-$i, $x-$i, $color);
}

header('Content-Type: image/png');
imagepng($thumb);
imagedestroy($thumb);