php-interview-prep/factorial.php at master · patilsp/php-interview-prep · GitHub

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<?php
$num = 4;
$factorial = 1;
for ($x=$num; $x>=1; $x--)
{
  $factorial = $factorial * $x;
}
echo "Factorial of $num is $factorial";
?>


Factorial using Form in PHP
<html>
<head>
<title>Factorial Program using loop in PHP</title>
</head>
<body>
<form method="post">
    Enter the Number:<br>
    <input type="number" name="number" id="number">
    <input type="submit" name="submit" value="Submit" />
</form>
<?php
    if($_POST){
        $fact = 1;
        //getting value from input text box 'number'
        $number = $_POST['number'];
        echo "Factorial of $number:<br><br>";
        //start loop
        for ($i = 1; $i <= $number; $i++){
            $fact = $fact * $i;
            }
            echo $fact . "<br>";
    }
?>
</body>
</html>


//Factorial using recursion
<?php
function fact ($n)
{
    if($n <= 1)
    {
        return 1;
    }
    else
    {
        return $n * fact($n - 1);
    }
}

echo "Factorial of 6 is " .fact(6);
?>