What are the best practices for handling variables in PHP functions to avoid issues like the one described in the thread?

The issue described in the thread is caused by passing variables by reference in PHP functions, which can lead to unexpected behavior if not handled correctly. To avoid this issue, it is best practice to pass variables by value or use the `&` symbol to explicitly pass variables by reference. 

function addOne(&$num) {
    $num += 1;
}

$number = 5;
addOne($number);
echo $number; // Output: 6

Keywords

variable scope global keyword static keyword pass by reference naming conventions

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