PHP Manual
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(PHP 4 >= 4.3.0, PHP 5)
This function is currently not documented; only the argument list is available.
image1 must be Truecolor, image2 must be Palette, and both image1 and image2 must be the same size.
Returns TRUE on success or FALSE on failure.
Note: This function is only available if PHP is compiled with the bundled version of the GD library.
Note: This function requires GD 2.0.1 or later.
See also imagecreatetruecolor().