What are the php extensions?

What is a PHP extension?

Provide some extended functions for PHP

Common PHP extensions

mysql-----Provide PHP to operate MySQL database Features

gd2----Dynamic creation of images

xdebug-----Track, debug and analyze the running status of PHP programs

View PHP extensions

1. Use phpinfo probe

phpinfo()---Output information about PHP configuration

Output the current status of PHP A large amount of information, including PHP compilation options, enabled extensions, PHP version, server information and environment variables (if compiled as a module), PHP environment variables, operating system version information, path variables, local values ​​​​of configuration options and main Value, HTTP header and PHP authorization information (license).

The above is PHP’s official explanation of the phpinfo() function. We will use this function to do a test.

First create a new file

<?php
 phpinfo();

Save and open this page in the browser, the browser will output the response information, including which PHP extensions we currently have enabled

2. Use get_loaded_extensions()

This function returns the names of all compiled and loaded modules in the PHP parser (both PHP extensions that have been enabled)

New The folder

<?php
get_loaded_extensions();

will print and enter all loaded PHP extensions on the screen, returning the value as an array

3. Use the extension_loaded(string name) function

Function: Check whether an extension is loaded

For example, if we check whether redis is loaded, we can write like this

<?php
extension_loaded("redis");

The return value is bool type, if it is loaded, it returns TRUE, otherwise it is FALSE

4. Command line mode to view which extensions are currently installed

php -m

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