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Imagick::writeImagesFile — Writes frames to a filehandle
$filehandle
[, string $format
] ) : boolWrites 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
成功时返回 TRUE。