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.
Generates an SHA-256 message digest for the image pixel stream.
Return Values
Returns a string containing the SHA-256 hash of the file, throwing an
ImagickException on error.