microtime
microtime — Return current Unix timestamp with microseconds.Description
microtime( bool $as_float = false ): string|floatmicrotime() returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call. For performance measurements, using hrtime() is recommended.
Parameters
as_float
If used and set to true, microtime() will return a float instead of a string, as described in the return values section below.
Return Values
By default, microtime() returns a string in the form "msec sec", where sec is the number of seconds since the Unix epoch (0:00:00 January 1,1970 GMT), and msec measures microseconds that have elapsed since sec and is also expressed in seconds.If as_float is set to true, then microtime() returns a float, which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond.
More information about microtime on official PHP documentation site
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