Image Thumbnail/Watermark Broken in PHP 4.3.2

[Temujin_12]

The server I was hosting my site on (for free so I can't complain too much)  crashed and the administrators migrated to a new server.  PHP 4.3.2 is on the new server (can't remember what was on the old).

 

I have the following script which thumbnails and/or watermarks an image and outputs it back to the browser:

<?php

ini_set("memory_limit", "16M");

// watermarks an image
// params	$sourcefile - image to watermark (gd resource or filename)
//		$watermarkfile - image to use as watermark (gd resource or filename)
//		$fileType - type of image ('gif', 'png', 'jpg')
// returns	gd image resource
// NOTE:	if passing resource for $sourcefile you must also pass 3rd parameter
function watermark(&$sourcefile, &$watermarkfile, $fileType="") {
// either create GD resource from path to png, or use passed in GD resource
if (gettype($watermarkfile) == "string") $watermarkfile_id = imagecreatefrompng($watermarkfile);
else $watermarkfile_id = $watermarkfile;

imageAlphaBlending($watermarkfile_id, false);
imageSaveAlpha($watermarkfile_id, true);

// either create GD resource from path to src image, or use passed in GD resource
if (gettype($sourcefile) == "string") {
	$fileType = strtolower(substr($sourcefile, strlen($sourcefile)-3));

	switch($fileType) {
		case('gif'):
			$sourcefile_id = imagecreatefromgif($sourcefile);
			break;

		case('png'):
			$sourcefile_id = imagecreatefrompng($sourcefile);
			break;

		default:
			$sourcefile_id = imagecreatefromjpeg($sourcefile);
	} // end switch
} // end if
else $sourcefile_id = $sourcefile;

//Get the sizes of both pix 
$sourcefile_width=imageSX($sourcefile_id);
$sourcefile_height=imageSY($sourcefile_id);
$watermarkfile_width=imageSX($watermarkfile_id);
$watermarkfile_height=imageSY($watermarkfile_id);

$dest_x = ( $sourcefile_width / 2 ) - ( $watermarkfile_width / 2 );
$dest_y = ( $sourcefile_height / 2 ) - ( $watermarkfile_height / 2 );

// if a gif, we have to upsample it to a truecolor image
if ($fileType == 'gif') {
	// create an empty truecolor container
	$tempimage = imagecreatetruecolor($sourcefile_width, $sourcefile_height);

	// copy the 8-bit gif into the truecolor image
	imagecopy($tempimage, $sourcefile_id, 0, 0, 0, 0, $sourcefile_width, $sourcefile_height);

	// copy the source_id int
	$sourcefile_id = $tempimage;
} // end if

imagecopy($sourcefile_id, $watermarkfile_id, $dest_x, $dest_y, 0, 0,
		$watermarkfile_width, $watermarkfile_height);


return $sourcefile_id;
} // end watermark function

// proportionally resizes image to fit into $max_width AND $max_height
// params:	$resource - filename<string> or gd image resource of image to resize
//		$max_width - <int>
//		$max_height - <int>
// returns	gd image resource of resulting resized image
function resizeImage(&$resource, $max_width, $max_height) {
if (gettype($resource) == "string") list($orig_width, $orig_height) = getimagesize($resource);
else {
	$orig_width = imagesx($resource);
	$orig_height = imagesy($resource);
} // end else

$width = $orig_width;
$height = $orig_height;

# taller
if ($height > $max_height) {
	$width = ($max_height / $height) * $width;
	$height = $max_height;
} // end if

# wider
if ($width > $max_width) {
	$height = ($max_width / $width) * $height;
	$width = $max_width;
} // end if
$image_p = imagecreatetruecolor($width, $height);

// if filename passed in then load gd resource
if (gettype($resource) == "string") {
	$fileType = strtolower(substr($resource, strlen($resource)-3));
	switch ($fileType) {
		case('gif'):
			$resource = imagecreatefromgif($resource);
			break;

		case('png'):
			$resource = imagecreatefrompng($resource);
			break;

		default:
			$resource = imagecreatefromjpeg($resource);
	} // end switch
} // end if

imagecopyresampled($image_p, $resource, 0, 0, 0, 0, $width, $height, $orig_width, $orig_height);

return $image_p;
} // end resizeImage

// do resizing and watermarking
if ($_GET) {
// get full server path to image
require_once 'DataObject_Connect.php';
require_once 'DataObjects/Session.php';
$session = new DataObjects_Session();
$session->get($_GET['session_id']);
$image_src = $session->getImagePath($_GET['filename'], true);

// determine resizing
switch ($_GET['size']) {
	case 'thumb':
		$resource = resizeImage($image_src, 100, 100);
	break;
	case 'regular':
		$resource = resizeImage($image_src, 292, 292);
	break;
	default:
		$watermark_src = $_SERVER["DOCUMENT_ROOT"]."/images/watermark.png";
		$resource = watermark($image_src, $watermark_src);
} // end switch

// output
header("Content-type: image/jpg");
imagejpeg ($resource, "", 100);
} // end if


?>

 

It worked on the old server but doesn't on the new server (PHP 4.3.2).  It looks like it is outputting data (ie: when I view the source it has binary data), but the images show up as broken and if I save it out to a file (either on the user using imagejpeg($resource, "/path/to/file", 100) or saving from the browser) any image manipulation program I try is unable to view it.

 

Any ideas as to why the above script wouldn't work for PHP 4.3.2?

 

I'm open to completely replacing my resizing/watermarking routines as long as they are functionally equivalent.