Fibonacci series of numbers in PHP

In Fibonacci series of numbers, each number is the sum of the two preceding ones.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377
Fn = F(n-1) + F(n-2)

Generating Fibonacci series in PHP where any number is sum of previous two numbers

Generating Fibonacci series using for loop

We will use for loop to generate the series.
$n1=1; // first number 
$n2=0; // second number
for($i=0;$i<=15;$i++){
echo " $n2,";
$temp=$n1+$n2; // temporary variable  
$n1=$n2;   // $n2 value shifted to $n1 
$n2=$temp; // temporary value ( sum ) is shifted. 	
}
Output
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610,

Using recursive function

function fibo($n){
if($n<=1){
return $n;}
else{
	return (fibo($n-1)+fibo($n-2));
}	
}

for ($i=0;$i<15;$i++){
echo fibo($i).", ";
}
Output
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,
Introduction to PHP Factorial of a number Sum of Digits of a number
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