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POinserting variable into database with php
 

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    <p>I'm editing part of a user login system and I'm very confused on one issue. I'm trying to allow the user to change their username using their email as a reference for the lookup. For some reason I can't get the $email variable to set properly. When I change the variable $email to an address that I know is in my database (meaning I remove $email and change it to an address that exists) the username is properly changed. When I swap it back to $email, nothing happens.</p> <p>The strange part is when I echo $email, the correct email address is displayed. I can't figure out why it won't let me do this despite it being echoed properly. Is it possible to not be a string despite an email address being displayed?</p> <p>I understand about sql injections. I'm just trying to keep the code as simple as possible for now so I can get the functionality working first.</p> <pre><code>&lt;? if (isset($_POST['submit'])) { $email = $user-&gt;get_email($username); $newuser = $_POST['newusername']; $server = 'localhost'; $usern = 'root'; $pass = ''; $connection = mysql_connect($server, $usern, $pass) or die(mysql_error()); mysql_select_db(testdb, $connection) or die(mysql_error()); if(isset($username)) { mysql_query("UPDATE users SET username='$newuser' WHERE email = '$email'") or die(mysql_error()); } } ?&gt; </code></pre> <p>Also, when I change the query statement so that the reference value is the userid, the username is correctly inserted. From this I know that $email isn't being set properly. </p> <pre><code>mysql_query("UPDATE users SET username='$newuser' WHERE userid = '$userid'") or die(mysql_error()); </code></pre>
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    1. USuser1104854
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    1. COWhy don't you use the `id` field in the `WHERE`? It's not only easier, it's also safer and faster.
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      1. USTom van der Woerdt
    2. COSQL injection all over the place here! Please please please sanitize your inputs!
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    3. COThat's what I am going to do. I just want to figure out why email won't work. It's really bugging me and it might help me in the future.
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