The php -m command is a quick and simple way to list all installed PHP extensions on a Linux machine. This method also proves useful when we need to check which PHP extensions are currently loaded.

Step 1: Click on the Config button then select the php. ini file for your PHP installation, and open it in a text editor. Step 2: Locate the line that specifies the location of the “extension = ” line. Step 3: Look for the extension you want to install and remove the semicolon preceding that line.

php file extension refers to the name of a file with a PHP script or source code that has a ". PHP" extension at the end of it. It's similar to a Word file with a . doc file extension.

Another way of getting the extension is to use the pathinfo() function. $extension = pathinfo($fileinfo->getFilename(), PATHINFO_EXTENSION);