Display number of days left on a trial period.

mepr-trial-num-days.php

<?php

function mepr_trial_num_days() {
	$user_id = get_current_user_id();
	$content = '';

	if ( 0 == $user_id ) {
		return;
	}

	$user = new MeprUser( $user_id );

	$txns = $user->active_product_subscriptions( 'transactions' );
	$subs = [];

	if ( is_array( $txns ) ) {
		foreach ( $txns as $txn ) {
			if ( ( $sub = $txn->subscription() ) && $sub->in_trial() && ! in_array( $sub->id, $subs ) ) {
				$subs[] = $sub;
			}
		}
	}
	
	foreach ( $subs as $sub ) {
		$content .= 'Days left on trial period: ' . $sub->days_till_expiration();
	}
	
	return $content;
}
add_shortcode('mepr-trial-num-days', 'mepr_trial_num_days');