Make posts older than 30 days free in PMPro

make_old_posts_free.php

<?php

// Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 
 /*
	Make any post older than 18 months available for free.
	
	Add this code to your active theme's functions.php or a
	custom plugin.
*/
function make_old_posts_free($hasaccess, $post, $user, $post_membership_levels)
{
	//if they already have access, let them at it
	if($hasaccess)
		return $hasaccess;
		
	//only make posts of type post (i.e. not pages or other CPTs) free
	if($post->post_type != 'post')
		return $hasaccess;
		
	//now check the publish date
	$published = strtotime( $post->post_date, current_time( 'timestamp' ) );
	$check_date = strtotime( '-30 Days', current_time( 'timestamp' ) ); //30 days older than todays date.


	if( pmpro_hasMembershipLevel('5') && ( $published < $check_date ) ){
		$hasaccess = true;
	}

	return $hasaccess;
}
add_filter('pmpro_has_membership_access_filter', 'make_old_posts_free', 15, 4);