(PHP 5 >= 5.5.0)
imagescale — Scale an image using the given new width and height
$image
   , int $new_width
   [, int $new_height = -1
   [, int $mode = IMG_BILINEAR_FIXED
  ]] )
This function is currently not documented; only its argument list is available.
imageAn image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
new_width
new_height
mode
      One of IMG_NEAREST_NEIGHBOUR,
      IMG_BILINEAR_FIXED,
      IMG_BICUBIC,
      IMG_BICUBIC_FIXED or anything else (will use two
      pass).
     
   Return scaled image resource on success or FALSE on failure.