Here are some ways that you can check the installed version of PHP in your system;

1. Run php -v from the command line.

   $ php -v
   PHP 7.0.19 (cli) (built: Jun 21 2017 07:13:57) ( NTS )
   Copyright (c) 1997-2017 The PHP Group
   Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies

2. Run php -i from the command line.

   $ php -i | grep "PHP Version"
   PHP Version => 7.0.19
   PHP Version => 7.0.19

3. Print PHP_VERSION_ID from PHP script.

   <?php 
   echo PHP_VERSION_ID;
   //Sample output: 70019
   ?>

4. Print phpversion() output from PHP script.

   <?php 
   echo phpversion();
   //Sample output: 7.0.19
   ?>

5. View from phpinfo() output

   <?php 
   phpinfo();
   ?>

   

6. Query your package manager where the PHP packages are installed from. Here’s a list of some common package managers and the corresponding commands;