php 判断二维数值是不是数组内的值

方法一： $user = array("ID"=>array( "0","1","2"),"Day"=>array("5")); //二维数组 $arrID = $user["ID"]; $str = "2"; //要判断的值 foreach ($arrID as $value){ //遍历数组arrID if ($str == $value){ //如果要判断的值在数组中