Convert files to executable

#! <executable directory> -> returns a file as executable, we are specifying who is going to execute the command that follows

#!                        -> it must necessarily be included at the beginning of the file. In the first line

#! /usr/local/bin/php
<?php
date_default_timezone_set("America/Bogota");
printf("%s\n", data("Y-m-d H:i:s"));

In this case, we are indicating to /usr/local/bin/php to run the command that is on the subsequent lines

So when we run example.php it runs automatically and you no longer have to indicate who is going to do it