Calculate Factorial of a Number Without Loop In Php(Recursive Function)

 <?php    

function factorial($n)    

{    

    if ($n < 0)    

        return -1; /*Wrong value*/    

    if ($n == 0)    

        return 1; /*Terminating condition*/    

    return ($n * factorial ($n -1));    

}    

    echo factorial(5);   

?>  

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