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.
Swirls the pixels about the center of the image, where degrees indicates
the sweep of the arc through which each pixel is moved. You get a more
dramatic effect as the degrees move from 1 to 360.
Return Values
Returns TRUE
on success.