Return current Unix timestamp with microseconds
Syntax
microtime(bool $as_float = false): string|float
Parameters
as_floatIf used and set to true, microtime() will return a float instead of a string, as described in the return values section below.
Return
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 as a decimal fraction.
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.
Examples
1 · void
<? $return = microtime(); echo $return; ?>
0.97396200 1695920089
2 · as_float
<? $as_float = true; $return = microtime($as_float); echo $return; ?>
1695920090.0455
3
<?
list($msec, $sec) = explode(" ", microtime());
$time = $sec + $msec;
echo $time;
?>1695920090.1059
4
<?
function microtime_as_float()
{
list($msec, $sec) = explode(" ", microtime());
$time = $sec + $msec;
return $time;
}
$time_start = microtime_as_float();
usleep(100);
$time_end = microtime_as_float();
$time = $time_end - $time_start;
echo "$time seconds";
?>0.00016593933105469 seconds
5
<? $as_float = true; $time_start = microtime($as_float); usleep(100); $time_end = microtime($as_float); $time = $time_end - $time_start; echo "$time seconds"; ?>
0.0001521110534668 seconds
6
<? // REQUEST_TIME_FLOAT contains the timestamp of the start of the request with microsecond precision usleep(100); $time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]; echo "$time seconds"; ?>
0.00034785270690918 seconds
