PHP Execution Operators
What are the Execution Operators?
How to execute a command?
The execution operator allows us to execute a command on the operating system that hosts the web server and PHP module and then capture the output. It consists of enclosing the command to be executed in back quotes (`).
In the above example the execution operator will execute the dir command to get a listing of files in the current web server directory
With the execution operator, we begin to experience the power of PHP as server side scripting environment. There are possible security risks, so be careful while using this operator.