PHP Recursive Functions

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PHP supports recursion, or in simple words, we can call a PHP function within another function without any argument, just like in C++. 200 is considered to be the maximum recursion level to avoid any crash of code.

Example 1: Code for displaying n numbers using recursive function in PHP.

<!DOCTYPE html>
<html>
<body>
 
<?php    
function NaturalNumbers($number) {    
if($number<=10){    
echo "$number <br/>";    
NaturalNumbers($number+1);    
}  
}    
 
NaturalNumbers(1);    
?>	
 
</body>
</html>

Output

1
2
3
4
5
6
7
8
9
10

Example 2: Code to generate factorial of a number using recursive function in PHP.

<!DOCTYPE html>
<html>
<body>
 
<?php    
function factorial($n)    
{    
if ($n < 0)    
return -1;  
if ($n == 0)    
return 1;
return ($n * factorial ($n -1));    
}    
 
echo factorial(10);    
?>	
 
</body>
</html>

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