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ÏÖÔÚÓÃÕâ¾ä$sql = "select * from user where 'username'='$username'";¾Í²»Äܳɹ¦µÇ¼,»¹ÊÇ˵Õâ¸ö²ÎÊý²»ÄÜÕâÑùд??
        ¸ÄÓÃ$sql = "select * from user";¾Í¿ÉÒԳɹ¦µÇ¼,µ«ÊÇÎÒÓÃecho $row[id];È¡IDµÄÖµ,ÊäÈëÁíÍâÕýÈ·µÄÓû§ÃûºÍÃÜÂë,È¡µ½µÄ»¹ÊǵÚÒ»¸öÓû§ÃûµÄID,Õâ¸öIDÊÇ×Ô¶¯Ôö³¤µÄ...

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<?php
include ("conn.php");
if ($_POST[submit]) {
$username = str_replace(" ", "", $_POST[name]);
$username = $_POST['username'];
$sql = "select * from user where 'username'='$username'";
$query = mysql_query($sql);
$us = is_array($row = mysql_fetch_array($query));
$ps = $us ? md5($_POST[pwd] . ALL_PS) == $row[password] : FALSE;
if ($ps) {
echo $row[id];
$_SESSION[id] = $row[id];
$_SESSION[user_shell] = md5($row[username] . $row[password] . ALL_PS);
echo "µÇ¼³É¹¦";

} else {
echo "ÃÜÂë»òÕßÓû§Ãû´íÎó ";
}

}
?>

  <form action="" method="post">

  Óû§Ãû: <input type="text" name="username" size=15/> <br>

  ÃÜ Âë: <input type="password" name="pwd" size=15/> <br>
 


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