/**********************   *@filename - path to the image   *@tmpname - temporary path to thumbnail   *@xmax - max width   *@ymax - max height   */   function resize_image($filename, $tmpname, $xmax, $ymax)   {   $ext = explode(".", $filename);   $ext = $ext[count($ext)-1];     if($ext == "jpg" || $ext == "jpeg")   $im = imagecreatefromjpeg($tmpname);   elseif($ext == "png")   $im = imagecreatefrompng($tmpname);   elseif($ext == "gif")   $im = imagecreatefromgif($tmpname);     $x = imagesx($im);   $y = imagesy($im);     if($x <= $xmax && $y <= $ymax)   return $im;     if($x >= $y) {   $newx = $xmax;   $newy = $newx * $y / $x;   }   else {   $newy = $ymax;   $newx = $x / $y * $newy;   }     $im2 = imagecreatetruecolor($newx, $newy);   imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);   return $im2;   }