ใครพอเข้าใจ ช่วยแปลงโค้ดjava ให้เป็นphpให้หน่อยนะคะ

function javatophp($st,$end)
{
	$sst = explode("/",$st);
	$sen =explode("/",$end);

	$s0 = $sst ['0']; // month before
	$s1 =  $sst ['1']; // $day before
	$s2 =  $sst ['2']; // year before

	$e0 =  $sen ['0']; // month after
	$e1 = $sen ['1'];  // $day after
	$e2 = $sen ['2'];  // year after
	//################
	/*<!-- Start Algorithm
	* verify $day each month
	*
	*/
	if(($s0==1)||($s0==3)||($s0==7)||($s0==8)||($s0==10)||($s0==12)||($s0==5))
	{
		$day = 31;
	}
	else if (($s0==4)||($s0==6)||($s0==9)||($s0==8)||($s0==11))
	{
		$day = 30;
	}
	else if (($s2==2012)||($s2==2016)||($s2==2020)||($s2==2024)||($s2==2028)||($s2==2022)||($s2==2026))
	{
		if($s0==2) 
			{
				$day = 29;
			}
	}
	else
	{
		$day = 28;
	}

	if($e2 > $s2)
	{ // verify year
		$d = ($day - $s1)+$e1;
	}
	else
	{
		if($e0 > $s0)
		{
			$d = ($day - $s1)+$e1;
		} //verify between month
		else 
		{
			$d = $e1 - $s1;
		} // in month
	}
	//<--End Algorithm -->
	//#################

	return $d;
}

echo javatophp("2/29/2012","4/25/2012")  //  year not more than 2026 only