If you are trying to figure out what version of PHP you are running on Linux then there are various ways to accomplish that. Below are some of the ways you can quickly and easily verify what version of PHP is installed.
The below command will be the easiest way to find it, if this fails though, please try some of the other methods listed.
Depending on what flavor of Linux you are running you can quickly and easily identify what version of PHP you are running by looking at your installed packages. Below are some commands based on different Linux distributions.
CentOS / Fedora / Red Hat
The first method below will generate a list of all packages currently installed and then pipe the output into grep so that we will only see the information we actually need.
rpm -qa | grep php
This second method will use yum to take a look directly at the PHP package.
yum info php | grep -i version
Debian / Ubuntu
The following commands will basically all give you the same information, what PHP packages and modules are installed as-well as what version they are.
apt list --installed</code> | grep php
dpkg --list | grep php
dpkg -l | grep php
Using PHPINFO() Function To Find PHP Version
If all else fails and you are certain you are running PHP then you could try one of the following. The first option will basically run the phpinfo() function inside your terminal and then find the php version, the second method will do the same but will actually go into a php file in your web directory.
echo "<?php phpinfo();" | php | grep "PHP Version"
To create a simple PHP script that will run phpinfo() function, please modify the following to point to your web directory. After running the command you should be able to navigate to it by opening a browser and pointing it to your domain.com/phpinfo.php.
echo '<?php phpinfo(); ?>' > /var/www/html/phpinfo.php
If you are still unable to verify what version of PHP you are running, you may want to double check that PHP is even installed.
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