It returns all the keys in a new array; this will be an indexed array. If you use $search_value in the parameters, it will return an array that contains a subset of keys with that value.

The PHP scandir function will return an indexed array of the files and directories within the specified directory path.

Just as on Linux, chown (change owner) in PHP changes the owner of the specified file or directory.

Today we will see what the PHP function chgrp does. In this post, we will deviate a little from what is given on php.net. Why? This is because PHP, in many of its naming conventions, draws from those of Linux, and I believe that a better explanation is to talk about both.