I have a pre-defined numbering, for example from 1 to 4.
Now I need it to show the numbers that are not being used, which would be:
Números não usados: 2,4
I started the code like this:
<?php
$numeros_sorteio="1,2,3,4";
$numeros_usados="1,3";
echo "numeros livres: 2,4";
?>
Could someone give me an orientation on how to continue?