Why This code shows error ?????

Question

https://code.sololearn.com/wQ4cfGxVbn8T/?ref=app

Answer 1

Why This code not shows error ?????
https://code.sololearn.com/waOP3RT3FBAG/?ref=app

Answer 2

You have a bunch of trailing invisible dots "." in your code that shouldn't be there. They are highlighted in red in the playground. Remove them and your code will run fine. see all <-- below

<?php <--
$x = 75; <--
$y = 25;

function addition() { <--
$GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y']; <--
}

addition(); <--
echo $z; <--
?>