Fibonacci series of numbers in PHP

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377

Generating Fibonacci series using for loop

$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. 	
}

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).", ";
}

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,