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PHP function Exercises: Create a function to calculate the factorial of positive a number

PHP function: Exercise-1 with Solution

Write a function to calculate the factorial of a number (a non-negative integer). The function accepts the number as an argument.

Pictorial Presentation:

PHP function Exercises: Create a function to calculate the factorial of positive a number

Sample Solution:

PHP Code:

<?php
function factorial_of_a_number($n)
{
  if($n ==0)
    {
	   return 1;
    }
  else 
    {	
	   return $n * factorial_of_a_number($n-1);
    }
	}
print_r(factorial_of_a_number(4)."\n");
?>

Sample Output: 

24

Flowchart :

Flowchart: Create a function to calculate the factorial of positive a number

PHP Code Editor:

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PHP: Tips of the Day

PHP: Anonymous recursive PHP functions

In order for it to work, you need to pass $factorial as a reference

$factorial = function( $n ) use ( &$factorial ) {
    if( $n == 1 ) return 1;
    return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );

Ref : https://bit.ly/38dj7jm