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

      
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
      

      
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
      

      
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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