Return current Unix timestamp with microseconds (original) (raw)
microtime
(PHP 4, PHP 5, PHP 7)
microtime — Return current Unix timestamp with microseconds
Description
microtime ([ bool $getAsFloat = FALSE ] ) : mixed
For performance measurements, using hrtime() is recommended.
Parameters
getAsFloat
If used and set to TRUE, microtime() will return afloat instead of a string, as described in the return values section below.
Return Values
By default, microtime() returns a string in the form "msec sec", where sec is the number of seconds since the Unix epoch (0:00:00 January 1,1970 GMT), and msec measures microseconds that have elapsed since sec and is also expressed in seconds.
If getAsFloat is set to TRUE, thenmicrotime() returns a float, which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond.
Examples
Example #1 Timing script execution with microtime()
`<?php
/**
- Simple function to replicate PHP 5 behaviour
*/
function microtime_float()
{
list($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 = 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 = 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)−time = microtime(true) - time=microtime(true)−_SERVER["REQUEST_TIME_FLOAT"];
echo
"Did nothing in $time seconds\n";
?> `