“Delete row” button for MySQL in PHP

Question

I have a table that becomes populated with data from a MySQL database, and each row receives its own delete button. I would like to have the option to delete each row separately with a delete button that deletes the corresponding row in the database. How would I go about doing so? Here's the part of the code that I have to far, which does not seem to work whatsoever.

if(isset($_POST['id'])) {
$id = $_POST['id'];
$delete = mysql_query($conn,"DELETE FROM mods WHERE id = '$id'");
}

Unimportant code omitted.

Table/Form Creation:

   echo "<td><form action=\"\" method=\"post\"></td>";
   echo "<tr class='modlist'>";
   echo "<td>".$row['id']."</td>";
   echo "<td><div class=\"edit\" id=\"div_1\">".$row['title']."</div></td>";
   echo "<td><div class=\"edit\" id=\"div_2\"><a href=".$row['mod_url'].">".$row['mod_url']."</a></div></td>";
   echo "<td><div class=\"edit\" id=\"div_3\">".$row['developer']."</div></td>";
   echo "<td><div class=\"edit\" id=\"div_4\">".$row['type']."</div></td>";
   echo "<td><div class=\"edit\" id=\"div_5\">".$v162."$nbsp".$v164."$nbsp".$v172."</div></td>";
   echo "<td><div class=\"edit\" id=\"div_6\">".$row['title'].",$nbsp".$row['developer']."</div></td>";
   echo "<td><div id=\"save\"><input type=\"submit\" name=\"save\" value=\"Save\"></div></td>";
   echo "<td><div id=\"delete\"><input type=\"submit\" name=\"delete\" value=\"Delete\"></div></td>";
   echo "</tr>";
   echo "</form>";
   }

Answer 1

You have the parameters for mysql_query() backwards. First pass the query, then pass the $conn.

$delete = mysql_query("DELETE FROM mods WHERE id = '$id'", $conn);

But beware you now have an SQL injection problem! Sanitize $id before you use it!

$id = mysql_real_escape_string($id);

And consider using mysqli or PDO (and use parameterized queries), as mysql_* are deprecated!

Answer 2

Form action needs to have a control with the name 'id', otherwise $_POST will not get any id.

You can do it like <input type="hidden" name="id" value=".$row['id']." /> <input type="hidden" name="id" value=".$row['id']." />

Also, I suggest you have a look at How can I prevent SQL injection in PHP? as your form, by the code you displayed, looks completely vulnerable.

UPDATE

You also have to fix your $delete query like nl-x mentioned:

$delete = mysql_query("DELETE FROM mods WHERE id = '$id'", $conn);