microtime
(PHP 4, PHP 5)
microtime — Return current Unix timestamp with microseconds
Description
microtime() returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call.
Parameters
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 get_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.
Changelog
| Version | Description |
|---|---|
| 5.0.0 |
The get_as_float parameter was added.
|
Examples
Example #1 Timing script execution with microtime()
<?php
/**
* Simple function to replicate PHP 5 behaviour
*/
function microtime_float()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
// Sleep for a while
usleep(100);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "Did nothing in $time seconds\n";
?>
Example #2 Timing script execution in PHP 5
<?php
$time_start = microtime(true);
// Sleep for a while
usleep(100);
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "Did nothing in $time seconds\n";
?>
Example #3 microtime() and REQUEST_TIME_FLOAT (as of PHP 5.4.0)
<?php
// Randomize sleeping time
usleep(mt_rand(100, 10000));
// As of PHP 5.4.0, REQUEST_TIME_FLOAT is available in the $_SERVER superglobal array.
// It contains the timestamp of the start of the request with microsecond precision.
$time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];
echo "Did nothing in $time seconds\n";
?>
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Коментарии
Sometimes you need to get not seconds but milliseconds since the UNIX epoch:
function millis() : int {
[$milli, $seconds] = explode(' ', microtime()); // from string(21) "0.67932100 1748377570"
return intval($seconds) * 1000 // intval(0.67932100 * 1000) is 679
+ intval(doubleval($milli) * 1000); // 679 + (1748377570 * 1000) = full milliseconds (1000 ms per one s)
}
The following tests execute with PHP 8.3.20
$start = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$temp = 3 ** 1000;
}
$end = microtime(true);
echo "Exec time = " . ($end - $start) . " Second(s)" . PHP_EOL;
}
>> Exec time = 0.047096014022827 Second(s)
===
$start = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$temp = pow(3, 1000);
}
$end = microtime(true);
echo "Exec time = " . ($end - $start) . " Second(s)" . PHP_EOL;
}
Exec time = 0.41157102584839 Second(s)