PHP - Combine images

from http://forums.bit-tech.net/showthread.php?t=117270

header ("Content-type: image/png");
$src = array ("http://img164.imageshack.us/img164/5175/toprb3.jpg",
"http://img123.imageshack.us/img123/9056/leftij4.jpg",
"http://miniprofile.xfire.com/bg/bg/type/1/blackburnperson.png", 
"http://img67.imageshack.us/img67/4786/rightnt1.jpg",
"http://img123.imageshack.us/img123/4891/bottomtp5.jpg");
$imgBuf = array ();

foreach ($src as $link)
{
   switch(substr ($link,strrpos ($link,".")+1))
   {
       case 'png':
           $iTmp = imagecreatefrompng($link);
           break;
       case 'gif':
           $iTmp = imagecreatefromgif($link);
           break;            
       case 'jpeg':        
       case 'jpg':
           $iTmp = imagecreatefromjpeg($link);
           break;            
   }
   array_push ($imgBuf,$iTmp);
}
$iOut = imagecreatetruecolor ("450","131") ;
imagecopy ($iOut,$imgBuf[0],0,0,0,0,imagesx($imgBuf[0]),imagesy($imgBuf[0]));
imagedestroy ($imgBuf[0]);
imagecopy ($iOut,$imgBuf[1],0,54,0,0,imagesx($imgBuf[1]),imagesy($imgBuf[1]));
imagedestroy ($imgBuf[1]);
imagecopy ($iOut,$imgBuf[2],15,54,0,0,imagesx($imgBuf[2]),imagesy($imgBuf[2]));
imagedestroy ($imgBuf[2]);
imagecopy ($iOut,$imgBuf[3],292,54,0,0,imagesx($imgBuf[3]),imagesy($imgBuf[3]));
imagedestroy ($imgBuf[3]);
imagecopy ($iOut,$imgBuf[4],0,117,0,0,imagesx($imgBuf[4]),imagesy($imgBuf[4]));
imagedestroy ($imgBuf[4]);
imagepng($iOut);