frontend_login_script.php

<?php 

function frontend_login_script( $user, $user_id ) {

	if( $user ) {
		$login_message = apply_filters( 'appp_login_success', sprintf( __('Welcome back %s!', 'apppresser'), $user->display_name), $user->ID );
		$username = $user->user_login;
		$avatar_url = get_avatar_url( $user->ID );
		$login_redirect = appp_get_login_redirect();

		?>
		<script type="text/javascript">

		var login_data = {
		message: '<?php echo $login_message; ?>', // welcome message
		username: '<?php echo $username; ?>', // name used in greeting
		avatar: '<?php echo $avatar_url; ?>', // URL to the avatar
		login_redirect: '<?php echo $login_redirect; ?>' // optional login redirect
		}

		window.apppresser.sendLoginMsg( true, login_data );

		</script><?php 
	}

}


function appp_get_login_redirect() {

	if( has_filter( 'appp_login_redirect' ) ) {
		$redirect_to = apply_filters( 'appp_login_redirect', '' );
		$post_id = url_to_postid( $redirect_to );

		$redirect = array(
			'url' => $redirect_to,
			'title' => ($post_id) ? get_the_title( $post_id ) : '',
		);	
		
	} else {
		$redirect = '';
	}

	return $redirect;
}

where does this code go?