time_expression

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

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          int time_expression( mixed expr );

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          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.

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

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