Thumbnailer w/ auto crop

rm_thumb.php

<?php

error_reporting(E_ALL);

function getExtension($filename, &$base = NULL) {
	$a = split('\.', $filename);
	$ext = array_pop($a);
	$base = join('.', $a);
	return strtolower($ext);
}

function getDimensionsInside($bounding_width, $bounding_height, $source_filename) {

	list($width, $height, $type, $attributes) = getimagesize($source_filename);
	$ratio = $width / $height;
	$bounding_ratio = $bounding_width / $bounding_height;

	if ($ratio >= $bounding_ratio) {
		return Array(
			$bounding_width, // w
			$bounding_width / $ratio, // h
		);
	} else {
		return Array(
			$bounding_height * $ratio,
			$bounding_height,
		);
	}
}

function getDimensionsMaxPixels($num_pixels, $source_filename) {
	list($width, $height, $type, $attributes) = getimagesize($source_filename);

	if ($num_pixels > $width * $height) {
		return Array($width, $height);
	}

	$ratio = $width / $height;
	$res = Array(
		round(sqrt($num_pixels * $ratio)),
		round(sqrt($num_pixels) / sqrt($ratio))
	);

	return $res;

}

function say() {
//	 return;
	echo "<pre>";
	$args = func_get_args();
	echo join(', ', $args);
	echo '</pre><br/>';
	exit();
}


function resizeImage($target_width, $target_height, $h_focus, $v_focus, $quality, $source_filename, $target_filename) {

	list($width, $height, $type, $attributes) = getimagesize($source_filename);

	$h_percent = $target_height / $height;
	$w_percent = $target_width / $width;

	$w_to_h = $width / $height;
	$bound_ratio = $target_width / $target_height;
	

	$ext = getExtension($source_filename);
	
	
	$data = file_get_contents($source_filename);
	
		
	ini_set('memory_limit', '80M');
	
	$source = imagecreatefromstring($data);
	
	
	$target = imagecreatetruecolor($target_width, $target_height);
	if ($w_to_h > $bound_ratio) {//$target_height <= $target_width) { // Taller than wider, use height;
		$pre_cropped_height = $target_height;
		$scale = $height / $target_height;
		$pre_cropped_width = $w_to_h * $pre_cropped_height;
	} else { // Use width
		$pre_cropped_width = $target_width;
		$scale = $width / $target_width;
		$pre_cropped_height = $pre_cropped_width / $w_to_h;
	}

	$x_offset = $scale * ($pre_cropped_width  - $target_width ) * $h_focus;
	$y_offset = $scale * ($pre_cropped_height - $target_height) * $v_focus;

#		say ($scale, $x_offset, $y_offset, $pre_cropped_width, $pre_cropped_height, $width, $height, $target_width, $target_height);

	imagecopyresampled($target, $source, 0, 0, $x_offset, $y_offset, $pre_cropped_width, $pre_cropped_height, $width, $height);
	if (! imagejpeg($target, $target_filename, $quality)) {
		die ("Error creating file $target_filename");
	}
	return $target;
}
$filename = basename(__FILE__);
$scriptname = basename($_SERVER['SCRIPT_NAME']);


if ($filename == $scriptname) {
	if (! isset($_GET['f'])) {
		die('4');
	}
	
	require_once(dirname(__FILE__).'/config.php');


	$filename = str_replace('..', '', urldecode($_GET['f']));
	$folder = $CONFIG['dirs']['img'];


	$width = (isset($_GET['w'])?$_GET['w']:200);
	$height = (isset($_GET['h'])?$_GET['h']:200);

	if (isset($_GET['fit'])) {
		list($width, $height) = getDimensionsInside($width, $height, $folder.$filename);
	}
	
#	print_r(Array($width, $height));

	$ext = getExtension($filename, $base);
	$hash = md5($filename.$width.$height).'.'.$ext;

	$destination = $_SERVER['DOCUMENT_ROOT'].'/cache/';

	if (! file_exists($folder.$filename)) {
		die($folder.$filename.' Does not exist');
	}

	if (file_exists($destination.$hash)) {
		$img = imagecreatefromjpeg($destination.$hash);
	} else {
		$img = resizeImage($width, $height, 0.5, 0.5, 90, $folder.$filename, $destination.$hash);
	}
	header('Content-Type: image/jpeg');
	imagejpeg($img);
}

?>

Don't judge the bad code in here.