Recursion and recursion to implement Fibonacci sequence algorithm

<?php
/*
f(n)=f(n-1)+f(n-2)
f(0)=0
f(1)=1
*/
function Fibonacci($n)
{
	if($n<=0)
	{
		return 0;
	}
	if($n==1)
	{
		return 1;
	}
	return f(n-1)+f(n-2);
}

/*
递推实现
*/
function Fibonacci1($n)
{
	if($n<=0)
	{
		return 0;
	}
	if($n==1)
	{
		return 1;
	}
	$fibNMinus
	$fibNMinusTwo=0;
	$fibN=0;
	for($i=2;$i<=n;$i++)
	{
		$fibN=$fibNMinusOne+$fibNMinusTwo;
		$fibNMinusTwo=$fibNMinusOne;
		$fibNMinus
	}

	return $fibN;
}

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The above has introduced the recursion and recursion to implement the Fibonacci sequence algorithm, including aspects of the algorithm. I hope it will be helpful to friends who are interested in PHP tutorials.