Woocommerce custom account page init action gives fields error on every page

Question

I am creating custom woocommerce register page. A customer can create an account using a name, an email and a mobile number. All three fields are required.

Here is my code:

add_action('init', 'devsol_customer_auth_register');
function devsol_customer_auth_register() {
    $customer_name = sanitize_text_field( $_POST['reg_billing_name'] );
    $customer_phone = sanitize_text_field( $_POST['reg_billing_phone'] );
    $customer_email = sanitize_email( $_POST['reg_billing_email'] );
    $customer_password = wp_generate_password( 12, false );
    $noemail = '';

if (isset( $_POST['reg_billing_name'] ) && empty( $_POST['reg_billing_name'])) {
    $GLOBALS['ERROR'] = 'register-name';
    } 
else if (isset( $_POST['reg_billing_email'] ) && empty( $_POST['reg_billing_email'])) {
    $GLOBALS['ERROR'] = 'register-email';
    }  

else if (email_exists($customer_email)) {
        $GLOBALS['ERROR'] = 'register-email-exist';  
}

else if (isset( $_POST['reg_billing_phone'] ) && empty( $_POST['reg_billing_phone'])) {
    $GLOBALS['ERROR'] = 'register-phone';
    }    

else if ((!preg_match('/^[0-9]{11}$/D', $_POST['reg_billing_phone'] )) && !empty( $_POST['reg_billing_phone'])) {
    $GLOBALS['ERROR'] = 'register-phone-validation';    
    }

else if (!username_exists($customer_phone)) {       
        $user_id = wp_create_user($customer_phone, $customer_password, $noemail);   
        if ( !is_wp_error( $user_id ) ) {          
        if ( apply_filters( 'woocommerce_registration_auth_new_customer', true, $user_id ) ) {
        wc_set_customer_auth_cookie( $user_id );
        }
        update_user_meta($user_id, 'billing_first_name', $customer_name);
        update_user_meta($user_id, 'billing_email', $customer_email);
        update_user_meta($user_id, 'billing_phone', $customer_phone);
        wp_update_user (array( 
            'ID' => $user_id,
            'first_name' => $customer_name,
            'display_name' => $customer_name,
            'nickname' => $customer_name,
            'role' => 'customer', ));  
        }        
    }   
    else {
        $GLOBALS['ERROR'] = 'duplicate-register';         
    }  
}

This is the output:

I am getting this error on every page

Notice: Undefined index: reg_billing_name in /Applications/AMPPS/www/flatsome/wp-content/plugins/devsol-auth-customer/index.php on line 110

Notice: Undefined index: reg_billing_phone in /Applications/AMPPS/www/flatsome/wp-content/plugins/devsol-auth-customer/index.php on line 111

Notice: Undefined index: reg_billing_email in /Applications/AMPPS/www/flatsome/wp-content/plugins/devsol-auth-customer/index.php on line 112

Notice: Undefined index: reg_billing_phone in /Applications/AMPPS/www/flatsome/wp-content/plugins/devsol-auth-customer/index.php on line 131

Please help.

Answer 1

You're seeing that notification everywhere because the devsol_customer_auth_register function is hooked into init which fires every time WordPress loads. There's likely a better hook to use.

add_action('init', 'devsol_customer_auth_register');

Secondly, The notification are coming from these lines, because the $_POST variable don't exist at the time when variables are being set to equal them.

    $customer_name = sanitize_text_field( $_POST['reg_billing_name'] );
    $customer_phone = sanitize_text_field( $_POST['reg_billing_phone'] );
    $customer_email = sanitize_email( $_POST['reg_billing_email'] );

To avoid this, check if the variables exist first.

    $customer_name  = null;
    $customer_phone = null;
    $customer_email = null;
    if ( isset( $_POST['reg_billing_name'] ) ) {
       $customer_name = sanitize_text_field( $_POST['reg_billing_name'] );
    }
    if ( isset( $_POST['reg_billing_phone'] ) ) {
       $customer_name = sanitize_text_field( $_POST['reg_billing_phone'] );
    }
    if ( isset( $_POST['reg_billing_email'] ) ) {
       $customer_name = sanitize_text_field( $_POST['reg_billing_email'] );
    }

And lastly, here's a snippet that should take care of adding those extra profile fields

function woocommerce_edit_my_account_page() {
    return apply_filters( 'woocommerce_forms_field', array(
        'woocommerce_reg_billing_name' => array(
            'type'        => 'text',
            'label'       => __( 'Reg Billing Name', 'textdomain' ),
            'placeholder' => __( 'Billing Name', 'textdomain' ),
            'required'    => false,
        ),
        'woocommerce_reg_billing_phone' => array(
            'type'        => 'text',
            'label'       => __( 'Reg Billing Phone', 'textdomain' ),
            'placeholder' => __( 'Billing Phone', 'textdomain' ),
            'required'    => false,
        ),
        'woocommerce_reg_billing_email' => array(
            'type'        => 'text',
            'label'       => __( 'Reg Billing Email', 'textdomain' ),
            'placeholder' => __( 'Billing Email', 'textdomain' ),
            'required'    => false,
        ),
    ) );
}
function edit_my_account_page_woocommerce() {
    $fields = woocommerce_edit_my_account_page();
    foreach ( $fields as $key => $field_args ) {
        woocommerce_form_field( $key, $field_args );
    }
}
add_action( 'woocommerce_register_form', 'edit_my_account_page_woocommerce', 15 );