How can understanding parameter swapping in recursive function calls help in debugging PHP code?

Understanding parameter swapping in recursive function calls can help in debugging PHP code by ensuring that the correct values are being passed to each recursive call. This can prevent unexpected behavior or errors that may arise from incorrect parameter values being used in subsequent recursive calls. By carefully tracking and swapping parameters as needed, you can ensure that the recursive function operates as intended and produces the correct results. 

function factorial($n, $result = 1) {
    if ($n == 0) {
        return $result;
    } else {
        return factorial($n - 1, $result * $n);
    }
}

// Example usage
echo factorial(5); // Output: 120

Keywords

PHP recursive functions parameter swapping debugging code optimization

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