A brief discussion on the method of converting time into timestamp in PHP

With the continuous development and popularization of the Internet era, Web development technology is constantly being applied and explored by people. As a commonly used web application development language and a widely used server-side scripting language, PHP is favored and used by more and more web developers. In PHP development, time management is also a very important issue. This article will introduce how to convert time into timestamp in PHP.

There are two ways to represent time in PHP, one is timestamp and the other is date format. The timestamp refers to the number of seconds that have elapsed from 00:00:00 on January 1, 1970 to a certain point in time. It is a purely numerical representation. The date format represents the time in the form of year, month, day, hour, minute and second, such as 2022-01-01 12:00:00.

In PHP, the method to convert date and time into a timestamp is very simple, just use the PHP built-in function strtotime(). The strtotime() function is used to convert human-readable date and time strings into Unix timestamp values. It is often used to convert date strings into timestamps in a specified format.

The following is an example of using the strtotime() function based on PHP:

// 将当前日期时间转换为时间戳
$timestamp = strtotime('now');

// 将指定日期时间转换为时间戳
$timestamp = strtotime('2022-01-01 12:00:00');

// 将指定日期转换为时间戳
$timestamp = strtotime('2022-01-01');

// 将明天此时的日期时间转换为时间戳
$timestamp = strtotime('tomorrow');

// 将昨天此时的日期时间转换为时间戳
$timestamp = strtotime('yesterday');

// 将下个星期二此时的日期时间转换为时间戳
$timestamp = strtotime('next Tuesday');

It can be seen that the strtotime() function can not only convert date and time strings into timestamps, but also supports some commonly used Date and time string formats, such as now, tomorrow, yesterday, next, etc.

However, it should be noted that the strtotime() function may fail to parse some date and time strings with special formats. Once the parsing fails, it will return false. For example:

// 解析失败，返回false
$timestamp = strtotime('2018-13-01');

At this time, the value of $timestamp will be false.

To sum up, the function used in PHP to convert date and time into timestamp is the strtotime() function, which can easily realize the conversion between date and time and timestamp, and also supports some commonly used functions. date and time string format, but it should be noted that some date and time strings with special formats need to be handled with caution to avoid parsing failure.

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