PHP Australia Conference 2015

gettimeofday

(PHP 4, PHP 5)

gettimeofdayGet current time

Description

mixed gettimeofday ([ bool $return_float = false ] )

This is an interface to gettimeofday(2). It returns an associative array containing the data returned from the system call.

Parameters

return_float

When set to TRUE, a float instead of an array is returned.

Return Values

By default an array is returned. If return_float is set, then a float is returned.

Array keys:

  • "sec" - seconds since the Unix Epoch
  • "usec" - microseconds
  • "minuteswest" - minutes west of Greenwich
  • "dsttime" - type of dst correction

Changelog

Version Description
5.1.0 The return_float parameter was added.

Examples

Example #1 gettimeofday() example

<?php
print_r
(gettimeofday());

echo 
gettimeofday(true);
?>

The above example will output something similar to:

Array
(
    [sec] => 1073504408
    [usec] => 238215
    [minuteswest] => 0
    [dsttime] => 1
)

1073504408.23910

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User Contributed Notes 2 notes

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2
middleto at pilot dot msu dot edu
15 years ago
The types of DST correction (from sys/time.h on a Linux system):
0     Not on DST
1     USA DST
2     Austrailian DST
3     Western European DST
4     Middle European DST
5     Eastern European DST
6     Canada DST
7     Great Britain and Eire DST
8     Rumania DST
9     Turkey
10     Australian DST (with shift in 1986)
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-1
lucas dot karisny at linuxmail dot org
9 years ago
A small improvement on getTimer.  Using vsprintf instead of sprintf there is no need to assign the array:

<?php
function utime()
{
  return (float) (
vsprintf('%d.%06d', gettimeofday()));
}
?>

In a test on my machine getTimer took 0.037519 seconds to run through 1000 iterations versus 0.027912 seconds for utime.  In total, utime runs about 25% quicker.  The use is negligible in an actual benchmarking scenario, but this could provide a slightly more accurate estimate.  Of course the time it takes to run the function could always be stored at the start and subtracted from your total value each time it is run.
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