WPMU DEV Forminator Pro: Use a form as registration form (Beta)

code.php

<?php

if( ! class_exists( 'Forminatio_Registration_Addon' ) )
{
	class Forminatio_Registration_Addon
	{
		// Registration Form ID
		static $Form_ID = '4599';
		
		static $map = array(
						'user_login' 		=> 'Username',
						'user_email'		=> 'Email Address'
					);
		
		protected function __construct()
		{
			//add_action( 'form_data_saved', array( $this, 'register_user' ), 99, 2 );
			add_filter( 'forminator_custom_form_submit_errors', array( $this, 'check_form_data' ), 99, 3 );
			add_action( 'forminator_custom_form_submit_before_set_fields', array( $this, 'register_user' ), 99, 3 );
		}
		
		public static function get_instance()
		{
			static $Inst = null;
			if( null == $Inst )
			{
				$Inst = new self();
			}
			
			return $Inst;
		}
		
		public function check_form_data( $submit_errors, $form_id, $field_data_array )
		{
			if( $form_id != self::$Form_ID ) return;
			$map = array();
			$fields = Forminator_API::get_form_fields( self::$Form_ID );
			
			foreach( $fields as $field )
			{
				if( $field->raw['field_label'] == self::$map['user_email'] )
				{
					$map['user_email'] = $field->slug;
				}
				if( $field->raw['field_label'] == self::$map['user_login'] )
				{
					$map['user_login'] = $field->slug;
				}
			}
			//print_r($map);
			
			foreach( $field_data_array as $arr )
			{
				if( $arr['name'] == $map['user_email'] )
				{
					$email = $arr['value'];
				}
				elseif( $arr['name'] == $map['user_login'] )
				{
					$username = $arr['value'];
				}
			}
			
			if( ! validate_username( $username ) )
			{
				$submit_errors[][ $map['user_login'] ] = 'The username is not valid!';
			}
			else if( username_exists( $username ) )
			{
				$submit_errors[][ $map['user_login'] ] = 'The username is already taken, choose another one!';
			}
			else if( email_exists( $email ) )
			{
				$submit_errors[][ $map['user_email'] ] = 'The email is already taken, choose another one!';
			}
			
			if( empty( $submit_errors ) )
			{
				
			}
			
			return $submit_errors;
		}
		
		public function register_user( $entry, $form_id, $field_data_array )
		{
			if( $form_id != self::$Form_ID ) return;
			
			$map = $userdata = $meta = array();
			$submitted_data = array(
				'user_description',
				'user_firstname',
				'user_lastname',
				'user_login',
				'user_nicename',
				'user_email',
				'user_url'
			);
			
			
			$fields = Forminator_API::get_form_fields( self::$Form_ID );
			
			foreach( $fields as $field )
			{
				$field_name = str_replace( ' ', '_', strtolower( $field->raw['field_label'] ) );
				if( in_array( $field_name, array( 'email', 'email_address' ) ) )
				{
					$userdata['user_email'] = $field->slug;
				}
				else if( in_array( $field_name, array( 'username', 'login', 'user_login' ) ) )
				{
					$userdata['user_login'] = $field->slug;
				}
				else if( in_array( $field_name, array( 'display_name' ) ) )
				{
					$userdata['display_name'] = $field->slug;
				}
				else if( in_array( $field_name, array( 'name' ) ) )
				{
					$userdata['first_name'] = $field->slug;
				}
				else if( in_array( 'user_' . $field_name, $submitted_data ) )
				{
					$userdata['user_' . $field_name] = $field->slug;
				}
				else
				{
					$meta[$field->slug] = $field_name;
				}
			}
			
			foreach( $field_data_array as $arr )
			{
				$key = array_search ( $arr['name'], $userdata );
				if( isset( $key ) && $key != '' )
				{
					$userdata[$key] = $arr['value'];
				}
			}
			
			$user_id = wp_insert_user( $userdata );
			
			foreach( $field_data_array as $arr )
			{
				if( ! in_array( $arr['name'], $userdata ) )
				{
					update_user_meta( $user_id, $meta( $arr['name'] ), $arr['value'] );
				}
			}
		}
	}
	
	Forminatio_Registration_Addon::get_instance();
}