add_action( 'wp_enqueue_scripts', 'myajax_data', 99 );
function myajax_data(){

	wp_localize_script('form', 'myajax',
		array(
			'url' => admin_url('admin-ajax.php')
		)
	);

}

add_action('wp_ajax_my_action', 'my_action_callback');
add_action('wp_ajax_nopriv_my_action', 'my_action_callback');
function my_action_callback() {

	$mailto = "mail@mail.com";

	/*
	if($_REQUEST['comment'] != '') {
		$body = "\n\nИмя: ".$_REQUEST['name']."\nТелефон: ".$_REQUEST['phone']."\nE-mail: ".$_REQUEST['email']."\nКомментарий: ".$_REQUEST['comment'];
	} else if($_REQUEST['num'] != '') {
		$body = "\n\nИмя: ".$_REQUEST['name']."\nТелефон: ".$_REQUEST['phone']."\nE-mail: ".$_REQUEST['email']."\nРазмер: ".$_REQUEST['num'];
	} else {
		$body = "\n\nИмя: ".$_REQUEST['name']."\nТелефон: ".$_REQUEST['phone']."\nE-mail: ".$_REQUEST['email'];
	}
	*/

	$body = "\n\nИмя: ".$_REQUEST['name']."\nТелефон: ".$_REQUEST['phone']."\nE-mail: ".$_REQUEST['email']."\nГород доставки: ".$_REQUEST['city']."\nКомментарий: ".$_REQUEST['comment'];

	$subject = "(msd-russia.ru)".$_REQUEST['subject'];
	mail_utf8($mailto, $subject, $body, 'mail@mail.com');

	function mail_utf8($to, $subject = '(No subject)', $message = '', $from) {
		$header = 'MIME-Version: 1.0' . "\n" . 'Content-type: text/plain; charset=UTF-8'. "\n" . 'From: <' . $from . ">\n";
		if(mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header))
		{
			echo '1';
		}
		else
		{
			echo '0';
		}
	}

	wp_die();
}