How to change apache to support php version

Apache is currently one of the most popular web server software. Due to its stability, reliability and adaptability, it is widely used in various web application scenarios. At the same time, with the widespread application of the PHP language in Web development, Apache has also become one of the main environments for PHP to run. This article will introduce how to change the supported version of PHP in the Apache server to adapt to different application scenarios.

First of all, we need to understand the relationship between the Apache server and the PHP language. Web servers use modules to extend or optimize their functionality. For Apache, it extends its functionality through a method called "modules". Among the Apache modules, there is a module about the PHP interpreter, which allows the Apache server to provide support for the parsing and execution of PHP files at runtime.

Different versions of PHP interpreters can provide different performance, functions and compatibility, so in different application scenarios, you may need to use different versions of PHP. There are two main ways to set the PHP version in Apache: using different PHP modules or using .htaccess files to specify different PHP versions.

The first method requires loading different versions of PHP modules specified in the Apache configuration file. Specifically, you need to change "mod_php5.so" or "mod_php7.so" after the "LoadModule" line sequence in Apache's main configuration file httpd.conf or Apache's virtual host configuration file to the specified version of the .so file. For example, if you want to use PHP 7.3 in Apache, you need to change "mod_php7.so" to "mod_php7.3.so" and restart the Apache server.

The second method is to use .htaccess files to specify different PHP versions. .htaccess is an Apache configuration file that affects the behavior of the website in the directory containing it and its subdirectories, and can easily run different versions of PHP in different directories. Specifically, you need to create a new file named ".htaccess" in the directory where you need to change the PHP version, edit it, and add the following three lines of code:

AddHandler application/x-httpd-php7.3 .php
<filesmatch>
    SetHandler application/x-httpd-php7.3
</filesmatch>

"php7.3" here can Change to other versions of PHP as needed. In this way, the PHP files in this directory will use the specified PHP version to run.

It is important to note that using a .htaccess file to set the PHP version may affect the performance of the website because it reloads the PHP module on every request. Therefore, for scenarios where PHP versions need to be changed frequently, the first method should still be used.

In general, it is very important to choose the correct PHP version for different application scenarios. This article introduces two common ways to change the PHP version in the Apache server. I hope it will be helpful to readers.

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