你只是把结果当作一列。。看起来更像

$check = "SELECT Name FROM data";
$result = mysqli_query($con, $check);
$row = mysqli_fetch_assoc($result)
if($row && $row["Name"] == null){
   //run this code 
}

您需要使用empty（）函数。更改为空，如下所示：

$check = "SELECT Name FROM data";
$name = mysqli_query($con, $check);
if(empty($name['Name'])){
   //run this code 
}

$check = "SELECT Name FROM data";
$name = mysqli_query($con, $check);
$nameAssoc = mysqli_fetch_assoc($name);
if(empty($NameAssoc['Name'])){
   //run this code 
}

您可以修改mysql查询，检查任何列是否为空。

$check = "SELECT count(*) FROM data where Name is not null and Name != '' ";
$name = mysqli_query($con, $check);
if($name > 0 ){
   //it means Name column is not null
}else{
// Name column is null
}