Let’s talk about the installation directory of php extension modules

PHP is a widely used programming language, and its powerful functions and flexible application forms have received widespread attention. PHP has many advantages, one of which is extension modules. Extension modules can add many functions to PHP, such as database connection, image processing, PDF generation, etc. However, for beginners and some users who are not familiar with PHP, the installation of extension modules may become a headache.

This article will mainly introduce the installation directory of the PHP extension module. Before we begin, let's first understand what a PHP extension module is.

1. What is a PHP extension module?

PHP extension module is a function provided by PHP. They can be dynamically loaded into PHP through the PHP extension mechanism, thereby expanding the functions of PHP. PHP extension modules are usually written in C and can only be loaded dynamically while PHP is running. PHP extension modules can add many powerful functions to PHP, such as database connection, image processing, PDF generation, encryption and decryption, etc.

2. The installation directory of the PHP extension module

The installation directory of the PHP extension module is in the PHP extension directory, and its location is determined by the "extension_dir" configuration item in the PHP.ini file. Specified. Specifically, the installation directory of PHP extension modules can be divided into two categories: system extensions and third-party extensions.

1. System extensions

System extensions are some extension modules pre-compiled by PHP. They will be installed in the system together with the installation of PHP. The directory of system extensions is generally located in the ext directory under the PHP installation path. For example, under Windows systems, the PHP extension directory is generally C:\php\ext; under Linux systems, the PHP extension directory is generally /usr/local/php/ext.

The advantage of system extensions is that they are very stable because they are pre-compiled and can be used directly. However, since it is an extension module that comes with PHP, its functionality and stability may not be as good as third-party extensions.

2. Third-party extensions

Third-party extensions are extension modules that are not pre-compiled by PHP itself. Usually, third-party extension modules are provided by open source communities or companies, and can be downloaded through the PHP PECL extension library or other websites. The directory of third-party extensions should generally be placed in the /usr/local/lib/php/extensions/version/ directory, where version refers to the PHP version number, such as /usr/local/lib/php/extensions/7.3/.

In the PHP.ini file, the so file of the third-party extension needs to be added to the PHP configuration file in the form of extension=extension.so, for example:

extension=imagick. so

The advantage of third-party extensions is that they can meet specific needs and are very powerful. However, since it is an extension module provided by a third party, you need to compile and install it yourself. You may encounter some problems that you need to solve by yourself.

3. Summary

This article mainly introduces the installation directory of PHP extension modules, and details the two different installation methods of system extensions and third-party extensions. For beginners and users who do not frequently use PHP, system extensions are relatively stable and simple to use; for users with specific needs, third-party extensions are more powerful, but they need to be compiled and installed by themselves. I believe that through the introduction of this article, readers will have a deeper understanding of the installation directory of PHP extension modules.

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