Shortcode to show a member's expiration date with Paid Memberships Pro

pmpro_expiration_date_shortcode.php

/*
	Shortcode to show a member's expiration date.
	
	Add this code to your active theme's functions.php or a custom plugin.
	
	Then add the shortcode [pmpro_expiration_date] where you want the current user's
	expiration date to appear.
	
	If the user is logged out or doesn't have an expiration date, then --- is shown.
*/
function pmpro_expiration_date_shortcode( $atts ) {
	//make sure PMPro is active
	if(!function_exists('pmpro_getMembershipLevelForUser'))
		return;
	
	//get attributes
	$a = shortcode_atts( array(
	    'user' => '',
	), $atts );
	
	//find user
	if(!empty($a['user']) && is_numeric($a['user'])) {
		$user_id = $a['user'];
	} elseif(!empty($a['user']) && strpos($a['user'], '@') !== false) {
		$user = get_user_by('email', $a['user']);
		$user_id = $user->ID;
	} elseif(!empty($a['user'])) {
		$user = get_user_by('login', $a['user']);
		$user_id = $user->ID;
	} else {
		$user_id = false;
	}
	
	//no user ID? bail
	if(!isset($user_id))
		return;

	//get the user's level
	$level = pmpro_getMembershipLevelForUser($user_id);

	if(!empty($level) && !empty($level->enddate))
		$content = date(get_option('date_format'), $level->enddate);
	else
		$content = "---";

	return $content;
}
add_shortcode('pmpro_expiration_date', 'pmpro_expiration_date_shortcode');

This recipe is included in the blog post on "Show a Member’s Expiration Date in a Page, Post, Widget, etc. via Shortcode" at Paid Memberships Pro here: https://www.paidmembershipspro.com/show-members-expiration-date-page-post-widget-etc-via-shortcode/