(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
이 함수는 인수가 없습니다.
Returns TRUE if the object has more images when traversing the list in the reverse direction, returns FALSE if there are none.
Throws an GmagickException on error.