Adding some PHP to our website to handle the form submission, we also go over some PHP basics.

Links:
Echo - https://www.php.net/manual/en/function.echo.php
$_GET varable - https://www.php.net/manual/en/reserved.variables.get.php
$_POST variable - https://www.php.net/manual/en/reserved.variables.post.php
Variables - https://www.php.net/manual/en/language.variables.variable.php
Array - https://www.php.net/manual/en/language.types.array.php
Print_r - https://www.php.net/manual/en/function.print-r.php
Isset - https://www.php.net/manual/en/function.isset.php
Pre tag - https://www.w3schools.com/tags/tag_pre.asp