(PHP 7 >= 7.3.0)
hrtime — Get the system's high resolution time
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.
Whether the high resolution time should be returned as array or number.
Returns an array of integers in the form [seconds, nanoseconds], if the
get_as_number is false. Otherwise the nanoseconds
are returned as integer (64bit platforms) or float
Example #1 hrtime() usage
echo hrtime(true), PHP_EOL;
The above example will output something similar to:
10444739687370679 Array (  => 10444739  => 687464812 )