imagecopyresampled - change height relative to width

[JoeAtRevolutionUnltd]

I have CMS and I am trying to have uploaded images width shrink to 228px and shrink the height relative to that width.

Here is the current code I am using. I have a set width and the code works, but I need to get rid of the height and have it change dynamicaly.

   $newwidth = 228;
   $newheight = 163;

   $cur_dir = "../uploads/products/";
   
   $filename = $cur_dir.$cur_file;
   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!='')
   {
       list($width, $height) = getimagesize($filename);
       switch($format)
       {
           case 'image/jpeg':
           $source = imagecreatefromjpeg($filename);
           break;
           case 'image/gif';
           $source = imagecreatefromgif($filename);
           break;
           case 'image/png':
           $source = imagecreatefrompng($filename);
           break;
       }
       $thumb = imagecreatetruecolor($newwidth,$newheight);
       imagealphablending($thumb, false);
       $source = @imagecreatefromjpeg("$filename");
       imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
       $filename="$output_dir/$cur_file";
       @imagejpeg($thumb, $filename);

Can anyone help me out?

Thanks

 

[vacunita]

You are going to have to use the height and width you get from the getimagesize() function to calculate the new dimensions.

Something like this placed after you get the values from the getimagesize() function should work:

$newheight=round($height/($width/228));

----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.

 

[JoeAtRevolutionUnltd]

Thanks! That worked perfectly.