What potential issue is pointed out in the script regarding variable usage?

The potential issue pointed out in the script regarding variable usage is the lack of proper variable initialization or declaration before use. This can lead to errors or unexpected behavior in the code. To solve this issue, it is important to always initialize variables before using them to ensure they have a valid value.

// Incorrect variable usage
$number = 5;
$result = $number + $anotherNumber; // $anotherNumber is not initialized

// Correct variable usage
$number = 5;
$anotherNumber = 10;
$result = $number + $anotherNumber; // Now $anotherNumber is properly initialized