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This document uses PHP Chinese website manual Release
(PECL ev >= 0.2.0)
EvStat::prev — Returns the previous set of values returned by EvStat::attr
Just like EvStat::attr() , but returns the previous set of values.
此函数没有参数。
Returns an array with the same structure as the array returned by EvStat::attr() . The array contains previously detected values.