名称

time_expression() - return the amount of real time that an expression took

语法

int time_expression( mixed expr );

描述

Evaluate <expr>. The amount of real time that passed during the evaluation of <expr>, in microseconds, is returned. The precision of the value is not necessarily 1 microsecond; in fact, it probably is much less precise.

参考

rusage(3), function_profile(3), time(3)
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