$arr=array(100,200,250,400,305,650,850);//定义一个空数组$emptyArr=array();foreach ($arr as $ite){ $emptyArr[]=abs($ite-420);}echo "最大绝对值:".max($emptyArr);echo "<br>";echo "最小绝对值:".min($emptyArr);//最大绝对值:430//最小绝对值:20