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Dieses Dokument verwendet PHP-Handbuch für chinesische Websites Freigeben
(PECL weakref >= 0.1.0)
Weakref::valid — Checks whether the object referenced still exists
Checks whether the object referenced still exists.
此函数没有参数。
Returns TRUE
if the object still exists and is thus still accessible via
Weakref::get() , FALSE
otherwise.