Resizing gifs gives a black box

[JoeAtRevolutionUnltd]

Here is my code. It works fine with jpgs, but gifs give me a black box. Any help is appreciated.

Here is how it is called.

resize_Image($name,$directory,100,125,'thumbs/')

php5

function resize_Image($cur_file,$dir,$w,$h,$thumbs)		
{
   $cur_dir = $dir;
   $filename = $cur_dir.$cur_file;
   $output_dir = $cur_dir.$thumbs;

   if(preg_match("/.jpg/i", "$filename"))
   {
       $format = 'image/jpeg';
   }
   if (preg_match("/.gif/i", "$filename"))
   {
       $format = 'image/gif';
   }
   if(preg_match("/.png/i", "$filename"))
   {
       $format = 'image/png';
   }

   if($format!='')
   {
	switch($format)
        {
		case 'image/jpeg':
			$source = imagecreatefromjpeg($filename);
			break;

		case 'image/gif';
			$source = imagecreatefromgif($filename);
			break;

		case 'image/png':
			$source = imagecreatefrompng($filename);
	           	break;
       }

	list($width, $height) = getimagesize($filename);

	$thumb = imagecreatetruecolor($w,$h);
	imagealphablending($thumb, false);

	$wm = $width/$w;
	$hm = $height/$h;

	$h_height = $h/2;
	$w_height = $w/2;

	if($width > $height) {
		$adjusted_width = round($width / $hm);
		$half_width = $adjusted_width / 2;
		$int_width = $half_width - $w_height;

		$adjusted_width = $adjusted_width < $w ? $w : $adjusted_width;

	imagecopyresampled($thumb,$source,0,0,0,0,$adjusted_width,$h,$width,$height);
	}
	elseif(($width < $height)) {
		$adjusted_height = round($height / $wm);
		$half_height = $adjusted_height / 2;
		$int_height = $half_height - $h_height;

		$adjusted_height = $adjusted_height < $h ? $h : $adjusted_height;

imagecopyresampled($thumb,$source,0,-$int_height,0,0,$w,$adjusted_height,$width,$height);
	}
	elseif($width == $height) {
imagecopyresampled($thumb,$source,0,0,0,0,$w,$h,$width,$height);
	}

	$out_filename = $output_dir.$cur_file;

	switch($format)
        {
		case 'image/jpeg':
			@imagejpeg($thumb, $out_filename, 100);
			break;

		case 'image/gif';
			@imagegif($thumb, $out_filename, 100);
			break;

		case 'image/png':
			@imagepng($thumb, $out_filename, 100);
	            	break;
       }
		return true;
	}
	else
		return false;

 

[jpadie]

in debugging it is a good idea to remove the error suppressors.

i notice that you have applied a quality level to imagegif even though the function does not allow for one. i would suggest removing that and the prepended @ sign and reporting back. hopefully you will get some meaningful error language if the fix has not solved the problem