(PECL gmagick >= Unknown)
Gmagick::hasnextimage — Checks if the object has more images
Returns true
if the object has more images when traversing the list in the forward direction.
此函数没有参数。
Returns true
if the object has more images when traversing the list in the forward direction, returns false
if there are none.
错误时抛出 GmagickException。