Copy membership post requirements from one level to another.

pmpro_copy_membership_requirements.php

<?php
/*
 * Copy Membership Requirements from one level to another
 * 
 * Instructions:
 * 1. Set $copy_from and $copy_to to the level IDs you want
 * 2. Visit any page of your site and add "&copy_membership=1" to the address.
 *
 */
function pmpro_copy_membership_requirements() {
	
	//only let admins continue
	if(!current_user_can('manage_options'))
		return false;
	
	if(!empty($_REQUEST['copy_membership'])) {
		global $wpdb;
		$copy_from = 1; //level id to copy from
		$copy_to = 2; //level id to copy to
		$rows_to_copy = $wpdb->get_results(
			"
            SELECT *
            FROM $wpdb->pmpro_memberships_pages
            WHERE membership_id = {$copy_from}
            ", ARRAY_A
		);
		foreach ($rows_to_copy as $row) {
			$success = $wpdb->replace($wpdb->pmpro_memberships_pages, array(
				'membership_id' => $copy_to,
				'page_id' => $row['page_id']
			));
			if(!empty($success))
				echo "added membership level {$copy_to} to post {$row['page_id']}...<br>";
		}
		die();
	}
}
add_action('init', 'pmpro_copy_membership_requirements');