Date/Time 函数
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gettimeofday

(PHP 4, PHP 5)

gettimeofday — 取得当前时间

说明

mixed gettimeofday ([ bool $return_float ] )

本函数是 gettimeofday(2) 的接口。返回一个关联数组，包含有系统调用返回的数据。

自 PHP 5.1.0 起有个可选参数 return_float，当其设为 TRUE 时，gettimeofday() 会返回一个浮点数。

数组中的键为：

Example #1 gettimeofday() example

<?php
print_r(gettimeofday());

echo gettimeofday(true);
?>

以上例程的输出类似于：

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

1073504408.23910

参数

return_float

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

返回值

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

Array keys:

更新日志

版本 说明
5.1.0 The return_float parameter was added.

范例

Example #2 gettimeofday() example

<?php
print_r(gettimeofday());

echo gettimeofday(true);
?>

以上例程的输出类似于：

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

1073504408.23910

Date/Time 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 取得当前时间

用户评论:

lucas dot karisny at linuxmail dot org (14-Feb-2005 02:26)

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.

middleto at pilot dot msu dot edu (13-Aug-1999 03:49)

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)