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    <p>You have a lot of logic problems.</p> <ol> <li><p>If the user ID is 0 (not logged in) then you kill the PHP script; nothing is returned. This is <em>not</em> the same as <code>false</code>, it will evaluate as <code>''</code> and <code>'' !== 0</code>.</p></li> <li><p>If the SQL statement fails, same problem.</p></li> </ol> <p>You need to re-factor your PHP script to either return a consistent result no matter what. Something like this:</p> <pre><code>&lt;?php $new_messages = false; if ($uid &gt; 0) { $sql = 'SELECT messagecount FROM Users WHERE uid = ? AND messagecount &gt;= 1'; $stmt = $db-&gt;prepare($sql); $stmt-&gt;execute(array($uid)); $row = $stmt-&gt;fetchObject(); if (is_object($row) &amp;&amp; intval($row-&gt;messagecount) !== intval($_POST['countOld'])) { $new_messages = true; } } header('Content-Type: application/json'); print json_encode(array( 'new_messages' =&gt; $new_messages )); </code></pre> <p>This will return a boolean (<code>true</code> or <code>false</code>) value no matter what, which you can then test against in your JavaScript:</p> <pre><code>$.post('messagecheck.php', { countOld: count }, function(result) { if (result &amp;&amp; result.new_messages) { if (result.new_messages === true) { alert('You have a new message.'); } } }); </code></pre> <p>Also, don’t use <code>mysql_</code> functions, they’re deprecated as per the warning on the PHP.net manual page: <a href="http://php.net/manual/en/function.mysql-query.php" rel="nofollow">http://php.net/manual/en/function.mysql-query.php</a>. Use <a href="http://php.net/manual/en/book.pdo.php" rel="nofollow">PDO</a> or <a href="http://php.net/manual/en/book.mysqli.php" rel="nofollow">MySQLi</a> instead.</p>
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    1. POjQuery Code runs no matter what
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    1. USMartin Bean
    1. USMartin Bean
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    1. COWhen I try this i get this error: Parse error: syntax error, unexpected T_PRINT in messagecheck.php on line 43
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    2. COMissing ; on the end of header() but now i get this Warning: Cannot modify header information - headers already sent by (output started at functions.php:61) functions.php is included at the top
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    3. COThe error message is telling you problem: somewhere in **functions.php** you’ve got code that sends output, whether it’s a `print()` statement or `echo()` statement or something of that ilk.
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