(PHP 4 >= 4.0.1, PHP 5)
imagepalettecopy — Copy the palette from one image to another
$destination
   , resource $source
   )
    imagepalettecopy() copies the palette from the
   source image to the 
   destination image.
  
destination
     The destination image resource.
source
     The source image resource.
No value is returned.
Example #1 imagepalettecopy() example
<?php
// Create two palette images
$palette1 = imagecreate(100, 100);
$palette2 = imagecreate(100, 100);
// Allocate the background to be 
// green in the first palette image
$green = imagecolorallocate($palette1, 0, 255, 0);
// Copy the palette from image 1 to image 2
imagepalettecopy($palette2, $palette1);
// Since the palette is now copied we can use the 
// green color allocated to image 1 without using 
// imagecolorallocate() twice
imagefilledrectangle($palette2, 0, 0, 99, 99, $green);
// Output image to the browser
header('Content-type: image/png');
imagepng($palette2);
imagedestroy($palette1);
imagedestroy($palette2);
?>