Mailchimp Subscribe for wordpress ajax.

mailchimp-subscribe-wp-ajax.php

/**
 * Mailchimp Email Subscription Handler
 *
 * @since 1.0.0
 * @version 1.0.0
 * @author Aminul Islam <aminmedia@gmail.com>
 */
function yourtheme_mailchimp_subscribe() {
		
	// MC API and List ID
	$mc_api 	= 'API Key";
	$mc_list 	= 'List ID';
	
	// Get the Server ID
	$srv = substr($mc_api, -3);
	$subscribe_url = 'https://' . $srv . '.api.mailchimp.com/2.0/lists/subscribe';

	// Prepare email for MC
	$user_email 		= new StdClass();
	$user_email->email 	= $_REQUEST['email'];

	// Prepare name for MC
	$user_info 			= new StdClass();
	$user_info->fname 	= (!empty($_REQUEST['fname'])) ? $_REQUEST['fname'] : '' ;
	$user_info->lname 	= (!empty($_REQUEST['lname'])) ? $_REQUEST['lname'] : '' ;

	$parameters = array(
	    'apikey'	 	=> $mc_api,
	    'id' 			=> $mc_list,
	    'email' 		=> $user_email,
	    'merge_vars' 	=> $user_info,
	    'double_optin' 	=> false,
	    'send_welcome' 	=> true
	);

	// Get data from MC
	$mc_return_data = wp_remote_post( $subscribe_url, array(
		'body' 		=> json_encode($parameters),
		'headers' 	=> array('Content-Type: application/json')
	));
	// Decode JSON Data
	$mc_request = json_decode($mc_return_data['body'], true);
	
	if ( !empty( $mc_request['code'] ) && $mc_request['code'] === -100) {
		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
			echo 'Invalid Email Address';
			die();
		} else {
			wp_redirect( home_url() );
			exit();
		}
	} else if ( !empty( $mc_request['code'] ) && $mc_request['code'] === 214 ) {
		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
			echo "You are already on the list";
			die();
		} else {
			wp_redirect( home_url() );
			exit();
		}
	} else {
		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
			echo "You are added to your newsletter subscriber list.";
			die();
		} else {
			wp_redirect( home_url() );
			exit();
		}
	}
}

// Action it for ajax request
add_action( 'wp_ajax_nopriv_yourtheme_mailchimp_subscribe', 'yourtheme_mailchimp_subscribe' );
add_action( 'wp_ajax_yourtheme_mailchimp_subscribe', 'yourtheme_mailchimp_subscribe' );