(PECL gmagick >= Unknown)
Gmagick::haspreviousimage — Checks if the object has a previous image
Returns TRUE if the object has more images when traversing the list in the reverse direction
Diese Funktion hat keine Parameter.
Returns TRUE if the object has more images when traversing the list in the reverse direction, returns FALSE if there are none.
Wirft bei einem Fehler eine GmagickException.