How to convert PHP time to timestamp

In PHP programming, time is often involved, such as processing log records, report generation, countdown and other operations, and these operations require us to convert time into a timestamp. The timestamp refers to the number of milliseconds from 00:00:00 on January 1, 1970 to the current time, which can be used to easily calculate, sort, and other operations on time. Therefore, this article will briefly introduce how to convert PHP time to timestamp.

1. Use strtotime() function

The strtotime() function is a very practical function in PHP, which can convert string time into time stamp. It supports almost all time formats, including formats with Chinese or time zones, as follows:

<?php
    //将字符串时间转化为时间戳
    echo strtotime("now"); //当前时间戳
    echo strtotime("2018-07-27 10:10:10"); //将指定时间字符串转化为时间戳
    echo strtotime("+1 day"); //明天此时的时间戳
?>

2. Use the date() function

The date() function can convert a timestamp into a formatted date (such as Y-m-d H:i:s), or it can convert the current time into a string in a specified format. We can output the current time as a timestamp, as follows:

<?php
    //将当前时间转化为时间戳
    echo strtotime(date(&#39;Y-m-d H:i:s&#39;)); 
?>

3. Using the DateTime class

The DateTime class in PHP can be used very conveniently Handle time-related operations efficiently. We can use it to convert a time string into a timestamp, as follows:

<?php
    //将时间字符串转化为时间戳
    $date = DateTime::createFromFormat(&#39;Y-m-d H:i:s&#39;, &#39;2018-07-27 10:10:10&#39;); //创建日期对象
    echo $date->getTimestamp(); //输出该日期的时间戳
?>

4. Use the mktime() function

mktime() function A timestamp can be created from the specified date, time, time zone and other information, as follows:

<?php
    //将指定日期时间和时区创建为时间戳
    echo mktime(10, 10, 10, 07, 27, 2018); //2018-07-27 10:10:10的时间戳
?>

In actual applications, we can choose an appropriate method for time conversion according to specific needs.

Summary

This article introduces four ways to convert PHP time to timestamp, including using strtotime() function, date() function, DateTime class and mktime ()function. Timestamps have a wide range of applications and we can use them to handle various complex time operations. I hope this article can help you better apply time-related functions in PHP.

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