php program to find factorial of a number

php program to find factorial of a number

Below given a simple php program with form to find factorial of a given number.

CODE :

<?php
$num=$_REQUEST['a'];
 $fact = 1;
    for($i = 1; $i <= $num ;$i++)
        $fact = $fact * $i;
    $res= $fact;
?>

<form action="" method="post">
<table width="50%" border="1">
  <tr>
    <td colspan="2" align="center">&nbsp;<?php echo $res;?></td>
 
  </tr>
  <tr>
    <td>SELECT NUMBER </td>
    <td><input type="text" name="a" /></td>
  </tr>
  <tr>
    <td colspan="2" align="center"><input type="submit" name="go" value="Submit" /></td>
   
  </tr>
</table>

</form>