调用mysqli函数出现有关问题，已经配置好环境

调用mysqli函数出现问题，已经配置好环境
$mysqli=new mysqli("localhost","root","12345","student");
$query="select * from person";
$result=$mysqli->query("$query");
if($result){
while($obj=$result->fetch_object()){
var_dump($obj);echo "
\n";

}}else{
echo "查询失败";
}
$result->free();
$mysqli->close();

?>

------解决方案--------------------
把错误输出看看

PHP code

if($result=$mysqli->query(......)) {//。。。。}else { echo $mysqli->error;//把错误输出看看}
 

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