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(PECL imagick 2, PECL imagick 3)
ImagickDraw::pushDefs — Indicates that following commands create named elements for early processing
本函数还未编写文档，仅有参数列表。
Indicates that commands up to a terminating ImagickDraw::popDefs() command create named elements (e.g. clip-paths, textures, etc.) which may safely be processed earlier for the sake of efficiency.
没有返回值。
