Моя функция isset не работает

Question

У меня есть опыт работы с PHP, но у меня возникла проблема с формой входа и регистрации, которую я создал. Функция My Исеть() не признается, что кнопка отправки нажата, несмотря на то, что имена правильно:

if (isset($_POST['register'])){ 
$fn = mysql_real_escape_string($_POST['firstname']); 
$ln = mysql_real_escape_string($_POST['lastname']); 
$regusername = mysql_real_escape_string($_POST['reg_username']); 
$regemail = mysql_real_escape_string($_POST['reg_email']); 
$regpass1 = mysql_real_escape_string($_POST['reg_password']); 
$regpass2 = mysql_real_escape_string($_POST['reg_password2']); 
$date = date('Y','m','d'); 

if(empty($fn)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please input your first name!');</script>"); 
} 

if(empty($ln)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please input your last name!');</script>"); 
} 

if(empty($regusername)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please input a username!');</script>"); 
} 

if(empty($regemail)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please input your email!');</script>"); 
} 

if(empty($regpass1)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please input a password!');</script>"); 
} 

if(empty($regpass2)){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Please repeat your password!');</script>"); 
} 

if($regpass1 != $regpass2){ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('Passwords dosen't match!');</script>"); 
} 

if($action['result'] != 'error'){ 
    $hash = hash('sha256', $regpass1); 

    //Creating a salt for the password 
    function createSalt(){ 
     $string = md5(unigid(rand(), true)); 
     return substr($string, 0, 3); 
    } 
    $salt = createSalt(); 
    $hash = hash('sha256', $salt . $hash); 
} 

$action['text'] = $text; 

//Sending data to MySQL 
$query = "INSERT INTO 'members' (firstname, lastname, username, email, password, salt, sign-up-date) 
      VALUES('$fn', '$ln', '$regusername', '$regemail', '$regpass1', '$salt' , '$date');"; 

mysql_query($query); 

if($query){ 
    echo "<script type='text/javascript'>alert('User was added!');</script>"; 
    mysql_close(); 
} 
else{ 
    $action['result'] = 'error'; 
    array_push($text, "<script type='text/javascript'>alert('User could not be added to the database.');</script>" . mysql_error()); 
} 
} 
//Registration END 

Регистрационная форма:

<div id="register_user" class="form-action hide" action="" method="post"> 

       <form> 
        <ul> 
         <li> 
          <input type="text" placeholder="First Name" name="firstname"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Last Name"name="lastname"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Username" name="reg_username"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Email" name="reg_email"/> 
         </li> 
         <li> 
          <input type="password" placeholder="Password" name="reg_password"/> 
         </li> 
         <li> 
          <input type="password" placeholder="Repeat password" name="reg_password2"/> 
         </li> 
         <li> 
          <input type="submit" value="Sign Up" class="button" name="register"/> 
         </li> 
        </ul> 
       </form> 
      </div> 

Пожалуйста, помогите мне решить эту проблему :)

Answer 1

ПРИМЕЧАНИЕ:action и method, используемые в теге <form>.

<div id="register_user" class="form-action hide"> 

       <form action="" method="post"> 
        <ul> 
         <li> 
          <input type="text" placeholder="First Name" name="firstname"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Last Name"name="lastname"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Username" name="reg_username"/> 
         </li> 
         <li> 
          <input type="text" placeholder="Email" name="reg_email"/> 
         </li> 
         <li> 
          <input type="password" placeholder="Password" name="reg_password"/> 
         </li> 
         <li> 
          <input type="password" placeholder="Repeat password" name="reg_password2"/> 
         </li> 
         <li> 
          <input type="submit" value="Sign Up" class="button" name="register"/> 
         </li> 
        </ul> 
       </form> 
      </div>