Are there any best practices for passing values in PHP to avoid issues like only being able to pass a value twice?

When passing values in PHP, it's important to avoid passing values by reference if you only intend to pass them a limited number of times. This is because passing values by reference can restrict the number of times a value can be passed, causing unexpected behavior. To avoid this issue, it's best to pass values by their actual value rather than by reference.

// Passing values by their actual value to avoid restrictions on the number of times they can be passed
$value = 10;

// Passing the value by its actual value
function passValue($val) {
    echo $val;
}

passValue($value); // Output: 10