Adds an extra page to manually add a referred user to an affiliate.

affiliate-manual-add.php

<?php

/**
* Plugin Name: Affiliate - Manual Add
* Plugin URI: https://premium.wpmudev.org/
* Description: Adds an extra page to manually add a referred user to an affiliate.
* Version: 1.0.0
* Author: Konstantinos Xenos @ WPMUDEV
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'Affiliate_Manually_Add' ) ) {
	class Affiliate_Manually_Add {

		/**
		 * Constructor.
		 */
		public function __construct() {
			add_action( 'init', array( $this, 'init' ) );
		}

		/**
		 * Initialization.
		 */
		public function init() {
			add_action( 'admin_menu', array( $this, 'create_menus' ) );
			add_action( 'network_admin_menu', array( $this, 'create_menus' ) );
			add_action( 'wp_ajax_affiliate-manaff-adref', array( $this, 'save_ref' ), 10, 3 );
		}

		/**
		 * Create the menus
		 */
		public function create_menus() {
			if ( function_exists( 'is_network_admin' ) && is_network_admin() ) {
				$capabilty = 'manage_network_options';
			} else {
				$capabilty = 'manage_options';
			}

			add_submenu_page(
				'affiliatesadmin',
				__( 'Manually Add', 'affiliate' ),
				__( 'Manually Add', 'affiliate' ),
				$capabilty,
				'affiliatesadminmanuallyadd',
				array( $this, 'create_page' )
			);
		}

		/**
		 * Create the Page
		 */
		public function create_page() {
			global $wpdb;
			?>
			<div class="wrap">
				<h2><?php esc_html_e( 'Manually Add Referrer', 'affiliate' ); ?></h2>
				<form class="manuallreferrer" name="manuallreferrer" method="POST">
					<table class="form-table">
						<tr>
							<th><label for="affid"><?php esc_html_e( 'Affiliate', 'affiliate' ); ?></label></th>
							<td>
								<select name="affid" id="affid">
								<?php
								$affs = get_users(
									array(
										'meta_key'   => 'enable_affiliate',
										'meta_value' => 'yes',
									)
								);
								foreach ( $affs as $aff ) {
									echo '<option value="' . $aff->ID . '">' . esc_html( $aff->user_login ) . '</option>';
								}
								?>
								</select>
							</td>
						</tr>
						<tr>
							<th><label for="refid"><?php esc_html_e( 'Referred', 'affiliate' ); ?></label></th>
							<td>
								<select name="refid" id="refid">
								<?php
								$refs = get_users();
								foreach ( $refs as $ref ) {
									echo '<option value="' . $ref->ID . '">' . esc_html( $ref->user_login ) . '</option>';
								}
								?>
								</select>
							</td>
						</tr>
						<tr>
							<td colspan="2" style="padding-left:0;">
								<input type="hidden" name="nonce" id="nonce" value="<?php echo wp_create_nonce( 'ref' . get_current_user_id() ); ?> ">
								<button type="submit" class="button button-primary"><?php esc_html_e( 'Submit', 'affiliate' ); ?></button>
							</td>
						</tr>
					</table>
				</form>
			</div>
			<script>
				( function ( $ ) {
					$( document ).ready(function() {
						$( '.manuallreferrer' ).on( 'submit', function( e ) {
							var affid = $( '#affid' ).val(),
								refid = $( '#refid' ).val(),
								nonce = $( '#nonce' ).val();

							e.preventDefault();

							data = {
								'action': 'affiliate-manaff-adref',
								'affid': affid,
								'refid': refid,
								'nonce': nonce
							};

							$.post( ajaxurl, data, function( response ) {
								if ( response.success ) {
									window.location.href = window.location.href;
								} else {
									console.log( 'invalid nonce' );
								}
							} );
						} );
					} );
				} ( jQuery ) );
			</script>
			<?php
		}

		/**
		 * Ajax Call
		 */
		public function save_ref() {
			$affid = intval( $_POST['affid'] );
			$refid = intval( $_POST['refid'] );
			$nonce = sanitize_text_field( $_POST['nonce'] );

			if ( ! wp_verify_nonce( $nonce, 'ref' . get_current_user_id() ) ) {
				wp_send_json_error();
			}

			update_user_meta( $refid, 'affiliate_referred_by', $affid );

			$aff = new affiliate();
			$rec = $aff->record_signup(
				$affiliate_user_id = $affid,
				$amount            = false,
				$area              = 'signup:user',
				$area_id           = $refid,
				$note              = 'User',
				$meta              = false
			);

			wp_send_json_success();
		}
	}

	new Affiliate_Manually_Add();
}