(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::writeImageFile — Writes an image to a filehandle
$filehandle, string $format = ?): boolWrites the image sequence to an open filehandle. The handle must be opened with for example fopen. 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 image.
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。