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PDO:ATTR_CLIENT_VERSION 这个双冒号是什么意义

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Release: 2016-06-13 12:31:55
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PDO::ATTR_CLIENT_VERSION 这个双冒号是什么意思

本帖最后由 lghyt 于 2013-12-06 12:34:45 编辑 PHP类中这两个符号用起来很眩晕。
PDO::ATTR_CLIENT_VERSION  这个双冒号是什么意思
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