(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::writeImagesFile — Writes frames to a filehandle
Writes all image frames into an open filehandle. This method can be used to write animated gifs or other multiframe images into open filehandle. 此方法在Imagick基于ImageMagick 6.3.6以上版本编译时可用。
filehandleFilehandle where to write the images.
formatThe image format. The list of valid format specifiers depends on the compiled feature set of ImageMagick, and can be queried at runtime via Imagick::queryFormats().
成功时返回 true。