mysql update getting input values from other table

i have a settings table for my php script
which i want to update
settings table contains
id | name | value | type
AI |baseurl|localhost|0-1

have loaded them on input with this

<?php
          $query = "SELECT * FROM settings";
          $result = mysql_query($query) or die(mysql_error());
          while($row = mysql_fetch_array($result)) {
          $setting_name = $row['setting_name'];
          $setting_value = $row['setting_value'];
          ?>

<input type = "text" name="<?= $setting_name ?>" value = "<?= $setting_name ?>"
}

PHP:

it displayes all inputs as i want
but on changing or resubmitting it gives error

here is my update query

          if (isset($_POST["submit"])) {
              $set1 = $_POST[$setting_name]; //LINE 31
              $set2 = $_POST[$setting_value]; // LINE 32

          $set_change = "UPDATE settings SET setting_value = '$set2' WHERE setting_name = '$set1'";
          $res_change = mysql_query($set_change) or die(mysql_error());
         
          }                  
            ?>

PHP:

it gives following errors

Notice: Undefined variable: setting_name in C:\xampp\htdocs\399\panel\settings.php on line 30

Notice: Undefined index: in C:\xampp\htdocs\399\panel\settings.php on line 30

Notice: Undefined variable: setting_value in C:\xampp\htdocs\399\panel\settings.php on line 31

Notice: Undefined index: in C:\xampp\htdocs\399\panel\settings.php on line 31

HTML:

 

Well, I'm assuming that you're trying to use a variable that isn't set.
Follow me on this: You're loading the variables from the database and then outputting them to a form. Which is fine. However, are you sure you want the value to be ['name'] and not the actual ['value']? As it is now, it's redundant to add the value to the output from the query.
But, when you're trying to update, the variables aren't set anymore - you're reloading the page on submit, and the variables aren't set. What you need to do is set those variables outside the loops, at the beginning of the page.
Apart from that, this is highly insecure - you're using mysql_, which has been deprecated for quite a while, and you're not validating your input at all - I suggest you look into using mysqli_ or PDO, and prepared queries.
Here's an example, based on PDO:

<?php
    //assumes you have a database-object created called $dbh

    $query = $dbh->query("SELECT * FROM settings");

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $setting_name = $row['setting_name'];
            $setting_value = $row['setting_value'];

            echo '<input type="text" name="'.$setting_name.'" value="'.$setting_value.'">';
        }

        if (isset($_POST["submit"])) {
            $set1 = $_POST[$setting_name]; //this might be set, but it will always be set to the last value pulled from the database
            $set2 = $_POST[$setting_value]; //same for this
            // I suggest doing it like this, if you don't want to write the name specifically:
            $dbh->beginTransaction(); //this starts a set of queries to run 
            foreach ($_POST as $key => $value) {
                $updatename = $key;
                $updatevalue = $value;
                $change_{$key} = $dbh->prepare("UPDATE settings SET setting_value = :updatevalue WHERE setting_name = :updatename");
                $change_{$key}->execute(array(':updatevalue'=>$updatevalue,':updatename'=>$updatename));
            }
            $dbh->commit(); //executes the prepared queries        
          }                  
?>

PHP:

Also, you should avoid shortcuts like <?= for echoing, and also, don't drop out and go in on php all the time - just echo out stuff directly.

 

this is an in house application not going to be live forever so i am not worried about mysql deprecated or security measure are not set
as all of the queries on other pages are with mysql i have no option for any thing other

about values what i want is
input forms load values from setting table so if a user do not change a value it will remain as it is and only changed inputs get updated

this is for defined things
some use config.php and define like $baseurl = "localhost/test/" and call it as they need
but i am storing them into table
for example if you go to digitalpoint.com/account/contact-details you will see your details
if you dont touch an input it stays same but you chnage only changed inputs are getting saved to your profile and non touched remain as they were