resize image and create thumbnail (fixed width and height)

image_resizer.php

<?php
// Get the image and create a thumbnail
$img = imagecreatefromjpeg($_FILES["Filedata"]["tmp_name"]);
if (!$img) {
	echo "ERROR:could not create image handle ". $_FILES["Filedata"]["tmp_name"];
	exit( 0 );
}

$width = imageSX($img);
$height = imageSY($img);
	
if (!$width || !$height) {
	echo "ERROR:Invalid width or height";
	exit(0);
}
				
// Portrait or landscape image?
if($width > $height) {
	$image_mode = 'landscape';
}
elseif($width < $height) {
	$image_mode = 'portrait';
}
else {
	$image_mode = 'landscape';
}

// Target sizes
$target_width = 200;
$target_height = 270;
	
$target_thumb_width = 88;
$target_thumb_height = 84;
	
// Calculate ratio of uploaded image
$target_ratio = $target_width / $target_height;
$target_thumb_ratio = $target_thumb_width / $target_thumb_height;
			
$img_ratio = $width / $height;
	
// calculate zwarte balken, onder of boven en hoe groot
if($image_mode == 'portrait') {
		
	if($img_ratio < $target_ratio) {
		//zwarte balken aan weerszijden	
		$resize_ratio = $target_height / $height;
		$new_width = $width * $resize_ratio;
			
		// calculate position of resized image in target size
		$blackness = $target_width - $new_width;
		$left_start = $blackness/2;
		$leftstart = round($left_start);
		$topstart = 0;
		$target_width = $new_width;
		
		// thumb resizen
		$resize_thumb_ratio = $target_thumb_height / $height;
		$new_thumb_width = $width * $resize_thumb_ratio;
		$blackness = $target_thumb_width - $new_thumb_width;
		$left_thumb_start = $blackness/2;
		$leftthumbstart = round($left_thumb_start);
		$topthumbstart = 0;
		$target_thumb_width = $new_thumb_width;						
				
	}
	else {
		// zwarte balken boven en onder
		$image_mode = 'landscape';
	}
}
				
if($image_mode == 'landscape') {
	// zwarte balken boven en onder
	if($img_ratio > $target_ratio) {
			
		// Berekeningen 
		$resize_ratio = $target_width / $width;
		$new_height = $height * $resize_ratio;
						
		// calculate position of resized image in target size
		$blackness = $target_height - $new_height;
		$top_start = $blackness/2;
		$topstart = round($top_start);
		$leftstart = 0;
		$target_height = $new_height;
				
		// thumb resizen
		$resize_thumb_ratio = $target_thumb_width / $width;
		$new_thumb_height = $height * $resize_thumb_ratio;
		$blackness = $target_thumb_height - $new_thumb_height;
		$top_thumb_start = $blackness/2;
		$topthumbstart = round($top_thumb_start);
		$leftthumbstart = 0;
		$target_thumb_height = $new_thumb_height;	
	}
					
}

// create 2 black (empty) images
$new_img = ImageCreateTrueColor(200, 270);
$new_thumb = ImageCreateTrueColor(88, 84);
		
// place resized image on black canvas
if (!@imagecopyresampled($new_img, $img, $leftstart, $topstart, 0, 0, $target_width, $target_height, $width, $height)) {
	echo "ERROR:Could not resize image";
	exit(0);
}
				
// place resized thumbnail on black canvas
if (!@imagecopyresampled($new_thumb, $img, $leftthumbstart, $topthumbstart, 0, 0, $target_thumb_width, $target_thumb_height, $width, $height)) {
	echo "ERROR:Could not resize image";
	exit(0);
}				
			
if (!isset($_SESSION["file_info"])) {
	$_SESSION["file_info"] = array();
}

// name of the new image
$file_id = $this->userId;
				
// Use a output buffering to load the image into a variable
imagejpeg( $new_img , 'assets/dynamic/images/'.$file_id.'.jpg' , 100 );
		
imagejpeg( $new_thumb , 'assets/dynamic/images/thumb_'.$file_id.'.jpg' , 100 );
							
echo $file_id;	// Return the file id to the script

// EOF
?>