写出以下输出结果

//(1)
$b = 100;
$c = 50;
$a = $b>$c?100:50;
echo $a;	//100

//(2)
$str = “php”;
$$str = “teems”;
$$str .= “coffice”;
echo $php;	//teemscoffice

//(3)
$a = “b”;
$b = “a”;
$ar[$a] = $b;
$ar[$b] = $a;
echo $ar[‘a’];	//b

//(4)
$n = 3.5;
$a = floor($n);
$b = round($n);
echo $a.$b;		//34
echo $a+$b;		//7
//注释：floor()：向下取整
//round() 4舍5入取整
//$a=3;$b=4;

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