How to convert seconds of time to timestamp using PHP

PHP is a very popular server-side programming language and one of the preferred languages ​​for developing web applications. PHP provides a number of functions for manipulating dates and times, including functions for converting seconds of time into timestamps. In this article, we'll look at how to convert seconds of time into a timestamp using PHP, and provide some code examples of practical applications.

What is a timestamp

A timestamp is a time representation in a computer system, usually expressed as an integer. It represents the number of seconds that have elapsed since 0:00:00 on January 1, 1970. In UNIX systems, timestamps are widely used to represent the modification time, creation time and other related time information of files.

How to convert seconds of time to timestamp

In PHP, we can use the built-in function strtotime() to convert seconds of time to timestamp. The following is the syntax of this function:

int strtotime ( string $time [, int $now = time() ] )

Among them, $timeThe parameter is the time string that needs to be converted. It supports almost all commonly used time formats, including YYYY-MM-DD, HH:MM:SS and Unix timestamps; $nowThe parameter is optional , which specifies the base time for conversion time, which defaults to the current time.

The following is an example that demonstrates how to convert seconds of time into a timestamp:

$time = "2021-10-01 10:10:10";
$timestamp = strtotime($time);
echo $timestamp;

This code first defines a time string $time, which Indicates 10:10:10 on October 1, 2021. Then use the strtotime() function to convert the time string to a timestamp and store the result in the variable $timestamp. Finally, use the echo statement to output the timestamp value.

Application example: counting article views

Suppose we are developing a blog system and need to count the views of each article. In the example just now, we have demonstrated how to convert seconds of time into a timestamp, now let's take a look at how to use this feature in an application.

First, we need to create a variable for each article to record its views. We can use $_SESSION in PHP to achieve this function, for example:

// 在文章页中初始化浏览量
if(!isset($_SESSION['views'])){
    $_SESSION['views'] = 0;
}

The above code initializes the $_SESSION['views'] variable in the article page. If the variable does not exist, then set its value to 0.

Next, we need to use the strtotime() function in the PHP code of the article page to convert the seconds of time into a timestamp and update the value of the page views. For example:

// 在文章页中统计浏览量
if(isset($_SESSION['views'])){
    if(!isset($_SESSION['last_visit_time']) || time()-strtotime($_SESSION['last_visit_time'])>86400){
        $_SESSION['views']++;
        $_SESSION['last_visit_time'] = date('Y-m-d H:i:s');
    }
}

The above code first determines whether $_SESSION['views'] exists. If it exists, check whether the last access time is more than one day. If it is more than one day, add 1 to the value of the $_SESSION['views'] variable and set the value of the $_SESSION['last_visit_time'] variable to the current time.

Finally, we can display the number of views of the current article on the article page, for example:

<p>浏览量：<?php  echo $_SESSION[&#39;views&#39;];?></p>

The above code displays the number of views of the current article. Since we have initialized the $_SESSION['views'] variable earlier, its value can be used directly here.

Conclusion

In this article, we looked at how to convert seconds of time into a timestamp using PHP and provided some code examples of practical applications. Whether you are developing a blogging system or other types of web applications, mastering this skill is very useful. Hope this article will be helpful to you.

The above is the detailed content of How to convert seconds of time to timestamp using PHP. For more information, please follow other related articles on the PHP Chinese website!