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$user = $_POST["user"];
$pwd = $_POST["pwd"];
$str = mysql_query("SELECT * FROM member WHERE user = '$user' or pwd='$pwd'");
$line = mysql_fetch_array($str);
if($line[1] == $user && $line[2] == $pwd){
echo "账号密码正确";
}else if($line[1] != $user){
var_dump($line[1]);
echo "账号错误";
}else if($line[2] != $pwd){
echo "密码错误";
}