Give access to specific membership level for PMPro Series posts.

pmpro-series-all-access.php

<?php
/**
 * Give "All Access" to PMPro Series for specific membership level.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function open_series_to_specific_level($hasaccess, $thepost, $theuser, $post_membership_levels) {

	// Bail if the user already has access to a post/page.
	if ( $hasaccess ) {
		return $hasaccess;
	}	

	if ( pmpro_hasMembershipLevel( 1 ) && $thepost->post_type == 'pmpro_series' ) { // Change level ID to match levels for all access.
		$hasaccess = true;
	}
	
	return $hasaccess;
}
add_filter("pmpro_has_membership_access_filter", "open_series_to_specific_level", 10, 4);