(PHP 7 >= 7.3.0)
hrtime — Get the system's high resolution time
hrtime ([ bool $get_as_number = false ] ) : mixed
Returns the system's high resolution time, counted from an arbitrary point in time. The delivered timestamp is monotonic and can not be adjusted.
get_as_number
Whether the high resolution time should be returned as array or number.
Returns an array of integers in the form [seconds, nanoseconds], if the parameter get_as_number
is false. Otherwise the nanoseconds are returned as int (64bit platforms) or float (32bit platforms).
Example #1 hrtime() usage
<?php echo hrtime(true), PHP_EOL; print_r(hrtime()); ?>
The above example will output something similar to:
10444739687370679 Array ( [0] => 10444739 [1] => 687464812 )
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https://www.php.net/manual/en/function.hrtime.php