Summary of methods for obtaining time in PHP (detailed examples)

In the previous article, I brought you "How to complete the time zone setting in PHP? 》, which introduces you to several methods on how to set the time zone in PHP. In this article, we will continue to take a look at the relevant knowledge of PHP. How should we get the current time in PHP? I hope it will be helpful to everyone. help!

In the date and time functions in PHP, if we want to get the current time, we need to understand what a UNIX timestamp is.

UNIX timestamp represents the total number of seconds since 0:00:00 (Greenwich Mean Time) on January 1, 1970 to the current moment. Let me introduce to you several functions that can get the current time

• <strong><span style="font-size: 18px;">time()</span></strong> Function

The time() function is the simplest function to get the current time. It can return the UNIX timestamp of the current time. An example is as follows:

<?php
echo time();
?>

When I run the function, the time is around 10:50 on October 21, 2021, and the output is as follows:

• <strong><span style="font-size: 18px;">mktime()</span></strong>Function

## The #mktime() function can not only return the UNIX timestamp of the current time, but also the UNIX timestamp of the specified time. Its syntax format is as follows:

mktime(指定时间时,指定时间分,指定时间秒,指定时间月,指定时间日,指定时间年)

The parameters of this function can be omitted from right to left, any Omitted arguments are set to the current local date and time values.

Get the UNIX timestamp of the current time, the example is as follows:

<?php
echo mktime();  // 没有设置参数则默认取得当前GMT时间
?>

Output result:

Get the UNIX timestamp of the specified time Timestamp, the example is as follows:

<?php
echo mktime(11,0,0,10,21,2021);  //设置参数表示GMT时间2021年10月21日11点0分0秒
?>

Output result:

• ##gmmktime()<strong><span style="font-size: 18px;"></span></strong>Function

  ##gmmktime() function can also obtain the GMT date. UNIX timestamp, its syntax format is as follows:

gmmktime(指定时间时,指定时间分,指定时间秒,指定时间月,指定时间日,指定时间年)

Like mktime, it can be omitted from right to left. Any omitted parameters will be set to the current value of the local date.

The example is as follows:

<?php
echo gmmktime();  //没有设置参数, 则默认取得当前GMT时间
?>

Output result:

It can be seen from the above example that when all parameters are omitted Finally, the parameters are set to the parameters of the current time in the current time zone, so the UNIX timestamp of the current time is output.

<?php
echo gmmktime(0,0,0,10,21,2021);  
?>

Output result:

As can be seen from the above example, the UNIX timestamp of the specified time can be obtained through the gmmktime() function.

• ##microtime()

  <strong><span style="font-size: 18px;"></span>Function</strong>The microtime() function can return the number of microseconds of the current UNIX timestamp. Its syntax is as follows:

  microtime ($get_as_float )

The example is as follows:

<?php
echo microtime();  
?>

Output result:

As can be seen from the above example, the number of microseconds can be output through the microtime function, but the format of the output result is that the previous part represents the microsecond part of the current UNIX timestamp, The latter is expressed as the number of seconds of the current UNIX timestamp.

Although the microtime function can display more detailed microseconds, it doesn't look very good. Is there any way to visually see the microseconds?

We can set the parameter behind the microtime function to true through the parameter settings behind the function, then a floating-point string will be returned to represent the time.

The example is as follows:

<?php
echo microtime(true);  //返回一个浮点型字符串表示时间
?>

Output result:

As can be seen from the above example, through the setting of parameters behind the function , which can return the current time more intuitively.

##getdate()

• <strong>## Function <span style="font-size: 18px;"></span></strong>

我们前面介绍了这么多的函数都能够获取当前的时间或者指定的时间的UNIX时间戳，getdate函数就比较厉害了，他可以取得日期时间信息。它的语法格式如下：

array getdate ([ int $timestamp = time() ] )

简单来说，getdate函数能够根据参数的信息返回一个关联数组，这个数组中包含了很多元素，下面给大家列举一下：

• seconds---表示秒的数字

• minutes---表示分钟的数字

• hours---表示小时的数字

• mday---表示月份中第几天的数字

• wday---星期中第几天的数字

• mon---表示月份中第几个月的数字

• year---用4 位数字表示的完整年份

• yday---表示一年中第几天的数字

• weekday---表示星期几的英文

• month---表示月份的英文

• 0---表示自从 UNIX 纪元开始至今的秒数   

示例如下：

<?php
echo "<pre class="brush:php;toolbar:false">";
var_dump(getdate());
?>

输出结果：

由上述示例中可以看出，通过getdate函数，返回的数组中包含了当前时间的相关信息。

大家如果感兴趣的话，可以点击《PHP视频教程》进行更多关于PHP知识的学习。

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