getNumberImages() isn't documented here but it is available. You can look at ImageMagick documentation for use.(PECL gmagick >= Unknown)
$GmagickDraw,$x,$y,$angle,$text$color,$width,$height,$inner_bevel,$outer_bevel$blackPoint,$gamma,$whitePoint,$channel = Gmagick::CHANNEL_DEFAULT$numColors,$colorspace,$treeDepth,$dither,$measureErrorgetNumberImages() isn't documented here but it is available. You can look at ImageMagick documentation for use.