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(PECL imagick 2, PECL imagick 3)
ImagickDraw::getStrokeLineJoin — Returns the shape to be used at the corners of paths when they are stroked
本函数还未编写文档，仅有参数列表。
Returns the shape to be used at the corners of paths (or other vector shapes) when they are stroked.
Returns a LINEJOIN constant
(imagick::LINEJOIN_*), or 0 if stroke line join is not set.
