Wordpress login with username, email and custom meta field

Question

I'm working on a custom Wordpress login form. At the moment users are able to login with their username or email but i also want to add the option to user their account-number. The account number is a custom metafield and is different form the id.

I've found the following hooks

• wp_authenticate_user
• wp_authenticate_username_password

but i've online seen options to remove the username of email not ways to add meta fields.

Kind regards

Answer 1

You need to add account number field to login form and then check or validate according to your need using wp_authenticate_user hook.

So you can try something like this:

//Add account number field on login form
add_action( 'login_form', 'myplugin_add_login_fields' );
function myplugin_add_login_fields() {
    $account_number = ( isset( $_POST['account_number'] ) ) ? $_POST['account_number'] : '';
    ?>
    <p>
        <label for="account_number"><?php _e('Account Number','mydomain') ?><br />
            <input type="text" name="account_number" id="account_number" class="input" value="<?php echo esc_attr(stripslashes($account_number)); ?>" size="25" /></label>
    </p>
    <?php
}

//check if account number is present or throw error if its not provided by the user.
//do any extra validation stuff here e.g. get account number from DB
add_filter('wp_authenticate_user','check_account_number', 10, 2);
function check_account_number($user, $password) {
    $return_value = $user;
    $account_number = ( isset( $_POST['account_number'] ) ) ? $_POST['account_number'] : '';
    if(empty($account_number)) {
        $return_value = new WP_Error( 'empty_account_number', 'Please enter account number.' );
    }

    //stop user from logging in if its account number is incorrect
    $account_number_db = get_user_meta($user->ID, 'lidnummer', true);
    if($account_number_db != $account_number) {
        $return_value = new WP_Error( 'invalid_account', 'Please enter your correct account number.' );
    }

    return $return_value;
}