(PECL gmagick >= Unknown)
Gmagick::getimageformat — Returns the format of a particular image in a sequence
Returns the format of a particular image in a sequence.
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
Returns a string containing the image format on success.
锟斤拷锟斤拷时锟阶筹拷 GmagickException锟斤拷