What are common pitfalls to avoid when using recursion in PHP?

One common pitfall to avoid when using recursion in PHP is not having a base case to stop the recursive calls, leading to infinite recursion and potential stack overflow. To solve this issue, always include a base case that defines when the recursion should stop. 

// Example of a recursive function with a base case to avoid infinite recursion
function countdown($num) {
    if ($num <= 0) {
        return;
    }
    
    echo $num . "<br>";
    countdown($num - 1);
}

countdown(5);

Keywords

recursion PHP stack overflow memory limit function calls

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