(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::writeImagesFile — Writes frames to a filehandle
public Imagick::writeImagesFile(resource $filehandle, string $format = ?): bool
Writes all image frames into an open filehandle. This method can be used to write animated gifs or other multiframe images into open filehandle. This method is available if Imagick has been compiled against ImageMagick version 6.3.6 or newer.
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().
Returns true on success.
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https://www.php.net/manual/en/imagick.writeimagesfile.php