In what scenarios is it necessary or beneficial to work with references in PHP methods?

Working with references in PHP methods is necessary when you want to modify the original value of a variable passed to a function, rather than just a copy of it. This can be beneficial when you need to make changes to a variable that should persist outside of the function scope. 

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

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

Keywords

PHP methods references pass by reference memory optimization performance optimization

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