What is recursion in PHP and how is it used?

Recursion in PHP is a programming technique where a function calls itself in order to solve a problem. This can be useful for tasks that can be broken down into smaller, similar subtasks. To use recursion in PHP, you define a function that calls itself within its own definition until a certain condition is met to stop the recursion. Example PHP code snippet demonstrating recursion: 

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

// Test the factorial function
echo factorial(5); // Outputs 120

Keywords

recursion PHP function base case stack overflow

Related Questions