how to change php version

PHP, as a web programming language, plays a very important role in the process of building a website. However, for various reasons (such as requirements of certain third-party software) you may need to change your PHP version.

So, how to change the PHP version? Let’s discuss this in detail next.

1. Check the current PHP version

Before changing the PHP version, we need to check the PHP version of the current system. You can check through the following methods:

1.1 Use the PHP command line

Enter the following command in the command line:

php -v

After execution, the current system will be displayed. PHP version information.

1.2 View phpinfo()

Create a phpinfo.php file in the root directory of your website with the content:

<?php phpinfo();
?>

Open the file and you will see Currently installed PHP version information and configuration information.

2. Find the required PHP version

Before changing the PHP version, you need to find the required PHP version first. Here are two search methods:

2.1 Use Google search engine

Enter "php version number download" in the Google search engine, such as "php 7.0.0 download", you can find the corresponding download link.

2.2 Download from the official website

Various versions of PHP can be found on the PHP official website (http://www.php.net/downloads.php).

3. Switch PHP version

After you find the PHP version you want, you can start switching versions. The following introduces three switching methods:

3.1 Use the command line to modify

Enter the following command in the command line:

update-alternatives --config php

After execution, all available options in the current system will be displayed. List of PHP versions. Follow the prompts to select the desired version to complete the version switch.

3.2 Use Apache module

Find the corresponding PHP module (such as mod_php) in the Apache configuration file, modify the module information to the required PHP version, save and restart Apache, that is Version switching can be completed.

3.3 Using FastCGI

Using FastCGI can support multiple PHP versions on a web server at the same time. Specify the path to the PHP executable file in the FastCGI configuration file to complete the version switch.

The above are three ways to change the PHP version. When switching versions, you need to pay attention to the stability of the current system and the impact on existing applications.

In addition, it should be noted that switching PHP versions may involve related components or third-party application servers with PHP extensions, etc. Therefore, before switching versions, relevant files and data need to be backed up in advance to avoid data loss or other unpredictable problems.

In short, although changing the PHP version is a bit cumbersome, as long as you follow the above steps, I believe you will successfully switch to the required version of PHP.

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