간단한 로그인 시스템 문제

Question

그래서 나는 만들고있는 웹 사이트에 간단한 로그인 시스템을 만드는 법을 배우고 있으며이 오류가 발생합니다.

공지 사항 : 정의되지 않은 상수 MyUserName 에다의 사용 -

라인 4 /home/dkitterm/public_html/index.php에 'MyUserName 에다'가정은이 라인 3-6이다.

내 로그인 확인 페이지입니다.

모든 체크 페이지의

 <?php 

    $host="localhost"; 
    $username="dkitterm"; 
    $password=""; 
    $db_name=""; 
    $tbl_name="members"; 

    //connect to server and db 
    mysql_connect("$host", "$username", "$password") or die("Server Down"); 
    mysql_select_db("$db_name") or die("cannot select DB"); 

    //username and password sent from form 
    $myusername=$_POST['myusername']; 
    $mypassword=$_POST['mypassword']; 

    //debunk 
    $myusername = stripslashes($myusername); 
    $mypassword = stripslashes($mypassword); 
    $myusername = mysql_real_escape_string($myusername); 
    $mypassword = mysql_real_escape_string($mypassword); 

    //encrypt password 
    $encrypted_mypassword=md5($mypassword); 


    $sql="SELECT * FROM members WHERE login='$myusername' and password='$encrypted_mypassword'"; 
    $result=mysql_query($sql); 

    // Mysql_num_row is counting table row 
    $count=mysql_num_rows($result); 
    // If result matched $myusername and $mypassword, table row must be 1 row 

    if($count==1){ 
    // Register $myusername, $mypassword and redirect to file     "login_success.php" 
    session_register("myusername"); 
    session_register("mypassword"); 
    header("location: index.php"); 
    } 
    else { 
    echo "Wrong Username or Password"; 
    } 
    ?> 

Answer 1

첫째는 상수로 취급 할 것이다 당신이

에

session_start(); 
    if(!session_is_registered("myusername")){ 
    header("location: main_login.php"); 
    die(); 
    } 

필요 있도록 100 %를 보호하고 주변 MyUserName 에다 다른 견적을 넣어하지 않는이 아니

Answer 2

@Col. Sharpanel은 감가 상각 된 함수를 사용했기 때문에 이것이 더 좋은 해결책이라고 말했습니다.

session_start(); 
    if(!isset($_SESSION['myusername'])){ 
    header("location: main_login.php"); 
    } 

    <?php 

$host="localhost"; 
$username="dkitterm"; 
$password=""; 
$db_name=""; 
$tbl_name="members"; 

//connect to server and db 
mysql_connect("$host", "$username", "$password") or die("Server Down"); 
mysql_select_db("$db_name") or die("cannot select DB"); 

//username and password sent from form 
$myusername=$_POST['myusername']; 
$mypassword=$_POST['mypassword']; 

//debunk 
$myusername = stripslashes($myusername); 
$mypassword = stripslashes($mypassword); 
$myusername = mysql_real_escape_string($myusername); 
$mypassword = mysql_real_escape_string($mypassword); 

//encrypt password 
$encrypted_mypassword=md5($mypassword); 


$sql="SELECT * FROM members WHERE login='$myusername' and password='$encrypted_mypassword'"; 
$result=mysql_query($sql); 

// Mysql_num_row is counting table row 
$count=mysql_num_rows($result); 
// If result matched $myusername and $mypassword, table row must be 1 row 

if($count==1){ 
// Register $myusername, $mypassword and redirect to file     "login_success.php" 
$_SESSION['myusername'] = $myusername; 
//if you need to register the password do the same but for the password 
header("location: index.php"); 
} 
else { 
echo "Wrong Username or Password"; 
} 
?>