That is not the main issue. I assume (based on trial) that the suffix .php is not recognized under wordpress, so I named the sandbox script just “myscript”. It looks like this:
[insert_php]
echo ‘Server date and time is: ‘;
echo date(‘l, F j, Y \a\t G:i:s’);
echo ‘<br> </br>’;
echo ‘Hallo ‘ . $_GET[“name”] . ‘!’;
[/insert_php]
If I call it as …/myscript it does give the date and says Hallo; if I say …/myscript?name=anna
it produces a 404 error.