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Showing help on 'ftime()'
Syntax: ftime ([INT monotonic]) => FLOATReturns the current time represented as the number of seconds and nanoseconds that have elapsed since midnight on 1 January 1970, Greenwich Mean Time.
If the <monotonic> argument is supplied and set to 1, the time returned will be monotonic. This means that will you will always get how much time has elapsed from an arbitrary, fixed point in the past that is unaffected by clock skew or other changes in the wall-clock. This is useful for benchmarking how long an operation takes, as it's unaffected by the actual system time.
The general rule of thumb is that you should use ftime() with no arguments for telling time and ftime() with the monotonic clock argument for measuring the passage of time.