帮看下这段代码，插入数据库部分出问题，没找到错误
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war-game -add your score
war game - add your score
                                         if(!empty($_post['submit']))
                        {
                                $first_name=$_post['first_name'];
                                $last_name=$_post['last_name'];
                                $score=$_post['score'];
                                echo $first_name;
                                echo $last_name;
                                echo $score;
$dbc=mysqli_connect('localhost','root','pengyu2408','score_list')or die('error in connet');
                                $query=insert into score_lis(first_name,last_name,score) values('$first_name','$last_name','$score');
                                mysqli_query($dbc,$query)or die('error_2');
                                echo 'thanks for adding your new high score!
';
                                echo 'first_name:'.$first_name.'
';
                                echo 'last_name:'.$last_name.'
';
                                echo 'score:'.$score.'
';
                                echo '<