Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Hides a digital watermark within the image. Recover the hidden watermark
later to prove that the authenticity of an image. Offset defines the start
position within the image to hide the watermark.
Return Values
Returns TRUE
on success.