User registration problem in wordpress

Question

I am trying to do a user registration form in my site's side bar, although users were able to register but instead of getting success message, wordpress usually redirect them to 404 page.

below is my form

<form id="joinmaillist"   method='post'>
    <table>
        <tr>
            <td>Name</td>
            <td><input type="text" placeholder="Your name here.." name="name" title="Please enter your name" required/></td>
        </tr>
        <tr>
            <td>Email</td>
            <td><input type="email" name="email" placeholder="Your email here.." required/></td>
        </tr>
        <tr>
            <td></td>
            <td style="text-align:right"><input class="submitmail" type="submit" value="Join!" name="joinm"/></td>
        </tr>
    </table>
</form>

and below is my php code

<?php
if (isset($_POST['joinm'])){
    $user_name=$_POST['name'];
    $email =$_POST['email'];


$user_id=  username_exists($user_name);

    if (!$user_id){
        $random_pass = wp_generate_password(12, false);
        $user_id=wp_create_user($user_name, $password, $email);
        header('Location:' . $_SERVER['REQUEST_URI']);
    }else{

    }
}

Answer 1

Look at the code in wp-login.php (line 481 and following). There you can see how registration works.

The names of your form – email, name – are probably overwritten by WordPress. Always use prefixed names in forms to avoid collisions, eg.: ma_email and ma_name.

Prepare incoming data. Do not just write anything someone sends you into your data base. It may be dangerous.

Oh, and welcome to WordPress Stack Exchange! :)