Custom Registration

Dear Ipstenu,

Thanks a lot for signup_extra_fields, I didn’t know about it! Now, I can add my custom fields:

add_action('signup_extra_fields','myplugin_register_form');
    function myplugin_register_form (){
        $first_name = ( isset( $_POST['first_name'] ) ) ? $_POST['first_name']: '';
		$last_name = ( isset( $_POST['last_name'] ) ) ? $_POST['last_name']: '';
		$validation_code = ( isset( $_POST['validation_code'] ) ) ? $_POST['validation_code']: '';
		?>
        <p>
            <label for="first_name"><?php _e('First Name','mydomain') ?><br />
            <input type="text" name="first_name" id="first_name" class="input" value="<?php echo esc_attr(stripslashes($first_name)); ?>" size="25" /></label>
		</p>
		<p>
			<label for="last_name"><?php _e('Last Name','mydomain') ?><br />
            <input type="text" name="last_name" id="last_name" class="input" value="<?php echo esc_attr(stripslashes($last_name)); ?>" size="25" /></label>
        </p>
		<p>
			<label for="validation_code"><?php _e('Validation Code','mydomain') ?><br />
            <input type="text" name="validation_code" id="validation_code" class="input" value="<?php echo esc_attr(stripslashes($validation_code)); ?>" size="25" /></label>
        </p>
        <?php
    }

(The code works well, but could you please confirm if it’s OK or not? Specially, if all the variables are necessary and defined in a correct way.)

Finally, I could fixed the validation step:

function myplugin_registration_errors ($result) {
	$error_name = $result[ 'errors' ]->get_error_message( 'user_name' );
	if ( $error_name == __('Sorry, usernames must have letters too!') ) {
		unset ( $result[ 'errors' ]->errors[ 'user_name' ] );
		if ( $_POST['user_name'] < 8000000000 || $_POST['user_name'] > 10000000000 )
			$result['errors']->add( 'user_name', __('<strong>ERROR</strong>: Username is not valid.','mydomain') );
	}
	if ( empty( $_POST['first_name'] ) )
		$result['errors']->add( 'first_name', __('<strong>ERROR</strong>: You must include a first name.','mydomain') );
	if ( empty( $_POST['last_name'] ) )
		$result['errors']->add( 'last_name', __('<strong>ERROR</strong>: You must include a last name.','mydomain') );
	if ( $_POST['validation_code'] != $_POST['user_name'] )
		$result['errors']->add( 'validation_code', __('<strong>ERROR</strong>: not valid.','mydomain') );
	return $result;
}

But, WordPress doesn’t check to see if the username has been already used anymore!
What’s wrong? And, how can I fix it? Should I copy the following code from ms-functions.php to my function? Or, is there a better way to fix this issue?

// Check if the username has been used already.
if ( username_exists($user_name) )
	$errors->add( 'user_name', __( 'Sorry, that username already exists!' ) );

// Has someone already signed up for this username?
$signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE user_login = %s", $user_name) );
if ( $signup != null ) {
	$registered_at =  mysql2date('U', $signup->registered);
	$now = current_time( 'timestamp', true );
	$diff = $now - $registered_at;
	// If registered more than two days ago, cancel registration and let this signup go through.
	if ( $diff > 2 * DAY_IN_SECONDS )
		$wpdb->delete( $wpdb->signups, array( 'user_login' => $user_name ) );
	else
		$errors->add('user_name', __('That username is currently reserved but may be available in a couple of days.'));

	if ( $signup->active == 0 && $signup->user_email == $user_email )
		$errors->add('user_email_used', __('username and email used'));
}

—————
Furthermore, since user_register is not called in a multisite installation, the third part of my plugin is not working anymore and I can’t save the extra registration user meta.
Could you please tell me where I should hook and how I can update the user meta?

Dear jkhongusc,

I have that problem (WordPress not checking for duplicate usernames) with numeric usernames. I think it might be because WordPress first checks to see if it’s a numeric username, and then it goes to see if it’s already exist or not. (The problem is definitely with the first if in my myplugin_registration_errors you can see above.)

And, about the extra user meta, I tried your method for first_name and last_name, but the first/last name fields in users profile were still empty after signup. Is there any way to get the $user_id and use update_user_meta()? (e.g. by hooking to wpmu_new_user?)
That would be more beneficial for me since I also want to use add_user_to_blog(). (I want to automatically add users to blogs based on their username.)