The factorial of a number n is defined by the product of all the digits from 1 to n (including 1 and n).
For example,
- 4! = 4*3*2*1 = 24
- 6! = 6*5*4*3*2*1 = 720
Note:
- It is denoted by n! and is calculated only for positive integers.
- Factorial of 0 is always 1.
The simplest way to find the factorial of a number is by using a loop.
There are two ways to find factorial in PHP:
- Using loop
- Using recursive method
Logic:
- Take a number.
- Take the descending positive integers.
- Multiply them.
Factorial using Form in PHP
Below program shows a form through which you can calculate factorial of any number.
<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>
PHP-TUTORIAL 
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You nee to configure google recaptcha in comment form of your blog. and you can use Google Captcha (reCAPTCHA) by BestWebSoft plugin. hope it helps!
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