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In mathematics, the  factorial  of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, The value of 0! is 1, according to the convention for an empty product. Read full about  factorial    here  on  wikipedia. We will use For loop for getting  factorial   of  a number, so we just have to decrease value by one and multiply with previous holding temporary value, We have to initiate temporary value with 1. The Following will be code: <input type="text" name="factroial4" id="factroial4" /> <br/> <button type="button" name="button" onclick="GetFactorial();" /> Calculate Factorial </button> <br/> <div id="showresulthere"></div> <script src="//code.jquery.com/jquery-1.11.2.min.js"></script> <script>  // function defination  function GetFactorial()    {

In mathematics, the  factorial  of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, The value of 0! is 1, according to the convention for an empty product. Read full about  factorial    here  on  wikipedia. We will use For loop for getting  factorial   of  a number, so we just have to decrease value by one and multiply with previous holding temporary value, We have to initiate temporary value with 1. The Following will be code: Function oriented way: <?php // function defination function GetFactorial($value) { $tempvalue = 1;  for ( $i=$value ; $i>0 ;  $i-- ) {   $tempvalue *=  $i ; // this is same as the   $tempvalue =  $tempvalue * $i ; } return $tempvalue; } // function defination // getting value by calling echo "<br/>Factorial of 1 is : ".GetFactorial(3); echo "<br/>Factorial of 2 is : ".GetFactorial(3); echo