从查询中获取单个值

Question

When someone joins a group, i want the creator of the group to get an email. So I query the database for the group with that group name and get the email of the group creator.

sql = "SELECT `groupcreatoremail` FROM `userchurch_signup` WHERE `groupname` = '". $groupname . "' limit 1" ;
$result = $conn->query($sql);
$creator_email = "";
while ($fieldinfo=mysqli_fetch_field($result)) {
    $creator_email = $fieldinfo->groupcreatoremail;
}

Based on testing I'm not getting anything even though if i run the SQL statement it works.

Answer 1

Referenced fetch_assoc about this simple issue. I would use their suggested method. however if you want to know more about the way you selected research on the function you're using.

More info can be found here how to use this information mysqli_fetch_field

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "result: " . $row["groupcreatoremail"]. "<br>";
    }
} else {
    echo "0 results";
}