php - Adding session in while (mysql) -

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if(isset($_session['username'])) {    $con = mysql_connect('localhost','root','');    mysql_select_db('chatbox',$con);     $result = mysql_query("select id users");    mysql_query("update users set `online` = 0 `username` = ".$username.""); }

can make username session (that logged in) equal to

mysql_query("update users set `online` = 0 `username` = "to_put_it_here");

simple , cute trick

$username = $_session['username'];     if(isset($username)) {    $con = mysql_connect('localhost','root','');    mysql_select_db('chatbox',$con);     $result = mysql_query("select id users");    mysql_query("update users set `online` = 0 `username` = '$username' "); }

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