check if php is installed code example

Example 1: how to cheeck php

<?phpphpinfo(); ?>

Example 2: test if php is installed

Create a php file containing code <? php echo phpinfo(); ?> and save it as test.php. 
  then you have installed PHP properly.

Example 3: php version command linux

# php -v
PHP 5.4.16 (cli) (built: Mar  7 2018 13:34:47) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

Example 4: php version command linux

# php --version
PHP 5.4.16 (cli) (built: Mar  7 2018 13:34:47) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies