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    <p>First and foremost, you should be warned that your code is completely vulnerable against <a href="http://en.wikipedia.org/wiki/SQL_injection" rel="nofollow">sql injections</a>. <a href="http://us2.php.net/manual/en/function.mysql-real-escape-string.php" rel="nofollow">Escaping</a> your POST data before inserting it into the database is a good start in protecting your database.</p> <p>Also, learning the <a href="http://us2.php.net/manual/en/ref.mysql.php" rel="nofollow">mysql extension</a> is useless for new systems because it is deprecated. You might think about looking into the <a href="http://www.php.net/manual/en/book.pdo.php" rel="nofollow">PDO</a> interface or the <a href="http://us3.php.net/manual/en/book.mysqli.php" rel="nofollow">mysqli</a> extension. There are many <a href="http://webdevrefinery.com/forums/topic/4995-beginners-guide-to-pdo/" rel="nofollow">beginner tutorials</a> for both and you will gain much more. </p> <h3>Now, as for your error</h3> <p>Make sure you are defining which ID you want to update in your database. In your second block of code you have:</p> <pre><code>//get the variables we transmitted from the form $id = $_POST['']; </code></pre> <p>needs to change to:</p> <pre><code>$id = $_POST['id']; </code></pre> <p>You said you get the error even if you change post to <code>$id = $_POST['ID']</code>, but if you look at your form, the id input has <code>name = 'id'</code> and PHP is case sensitive.</p> <p>Now, in your sql query, all of those back ticks are unnecessary. Also, there is no point in specifying which table ID because this is all being done in ONE table, TestTable. </p> <pre><code>//replace TestTable with the name of your table $sql = "UPDATE TestTable SET FName = '$fname',LName = '$lname', PHON = '$phon' WHERE ID = '$id' LIMIT 1"; </code></pre> <p><strong>EDIT:</strong> Although the query above is syntactically correct, you should consider using mysqli or PDO due to reasons mentioned above. Below are examples using mysqli and PDO. </p> <h2>Mysqli</h2> <p><a href="http://php.net/manual/en/book.mysqli.php" rel="nofollow">mysqli Manual</a> </p> <pre><code>/* connect to the database */ $mysqli = new mysqli("localhost", "user", "password", "database"); if ($mysqli-&gt;connect_errno) { echo "Failed to connect to MySQL: (" . $mysqli-&gt;connect_errno . ") " . $mysqli-&gt;connect_error; } /* build prepared statement */ $stmt = $mysqli-&gt;prepare("UPDATE TestTable SET FName=?, LName=?, PHON=? WHERE ID=?)"); /* bind your parameters */ $stmt-&gt;bind_param('sssi', $fname, $lname, $phon, $id); /* execute prepared statement */ $stmt-&gt;execute(); /* close connection */ $stmt-&gt;close(); </code></pre> <h2>PDO</h2> <p><a href="http://php.net/manual/en/book.pdo.php" rel="nofollow">PDO Manual</a></p> <pre><code>/* connect to the database */ $dbh = new PDO('mysql:host=localhost;dbname=database', $user, $pass); /* build prepared statement */ $stmt = $dbh-&gt;prepare("UPDATE TestTable SET FName = :fname, LName = :lname, PHON = :phon WHERE ID = :id"); /* bind your parameters */ $stmt-&gt;bindParam(':fname', $fname); $stmt-&gt;bindParam(':lname', $lname); $stmt-&gt;bindParam(':phon', $phon); $stmt-&gt;bindParam(':id', $id); /* update one row */ $fname = 'John'; # or use your $_POST data $lname = 'Doe'; $phon = '123-456-7890'; $id = 1; /* execute prepared statement */ $stmt-&gt;execute(); /* use it again!1! */ $fname = 'Jane'; $lname = 'Doe'; $phon = '123-456-7890'; $id = 2; /* execute prepared statement */ $stmt-&gt;execute(); /* close connection */ $dbh = null; </code></pre>
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    1. PONeed assistance with a php mysql UPDATE statement tutorial please
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    1. USCarrie Kendall
    1. USCarrie Kendall
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    1. CODon't forget to add filter and escape to your values. I know you advised it but its not in your code
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    2. CO@Baba better yet, i just added examples of using mysqli and PDO :]
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    3. CONice ... Nice very clean
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