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    <p>Two things that could have gone wrong.</p> <p><strong>First</strong>, <code>This function has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.</code> from the <a href="http://php.net/manual/en/function.session-register.php" rel="nofollow">documentation</a>. So delete these lines from checkLogin.php:</p> <blockquote> <p><strike>session_register("FirstName");</p> <p>session_register("LastName"); </strike></p> </blockquote> <p>And write this instead (note the added <a href="http://php.net/manual/es/function.session-start.php" rel="nofollow">session_start()</a> ):</p> <pre><code>session_start(); $_SESSION['FirstName'] = $FirstName; $_SESSION['LastName'] = $LastName; </code></pre> <p><strong>Second</strong> (might be derived from the first, might not be), the logic in inc_header_User.php could be wrong for your purposes, try changing it to:</p> <pre><code>session_start(); if(!isset($_SESSION['FirstName'])) { $FirstName = ''; echo "Hello"; }else{ $FirstName = $_SESSION['FirstName']; } </code></pre> <p><strong>Other notes:</strong> Is it an error, a notice or a warning? It doesn't look fatal actually, echoing a non-set variable will not likely kill your whole app.</p> <p>You are prone to MySQL injection, change the first lines to this:</p> <pre><code>$FirstName = mysql_real_escape_string($_POST['FirstName']); $LastName = mysql_real_escape_string($_POST['LastName']); </code></pre> <p>As already suggested, try using MySQLi or PDO instead of mysql_* functions for new code.</p>
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    1. PORetrieving first name and last name from mysql database
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    1. USFrancisco Presencia
    1. USFrancisco Presencia
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    1. VO
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      1. VTUpMod
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      1. VTAcceptedByOriginator
    1. CO+1, well explained.
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      1. USbudwiser
    2. COIs this better: if(!isset($_SESSION['FirstName'])) { echo "Hello"; }else{ $_SESSION['FirstName'] = $FirstName; } ?>
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      1. USJose Fuentes
    3. COI edited the answer since I found another logic mistake that is causing the actual error. If the session variable is not set, you keep it unset, which causes the problem. And I don't think that new code you wrote is better...
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      1. USFrancisco Presencia
 

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