Restricts content based on a CPT post's category.

my_restrict_qpm_form_categories.php

<?php
/**
 * Restricts content based on a CPT post's category.
 * If a CPT has a category restricted by a membership, then run restricton code
 * Please adjust the filter name to be 'pmpro_has_membership_access_filter_<<cpt_name>>'
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_restrict_qpm_form_categories( $hasaccess, $post, $user, $post_membership_levels ) {
    global $wpdb;

    if ( ! $hasaccess ) {
        return $hasaccess;
    }

    $post_categories = wp_get_post_categories( $post->ID );

    if ( ! empty( $post_categories ) ) {
        $sqlQuery = "(SELECT m.id, m.name FROM $wpdb->pmpro_memberships_categories mc LEFT JOIN $wpdb->pmpro_membership_levels m ON mc.membership_id = m.id WHERE mc.category_id IN(" . implode(",", $post_categories) . ") AND m.id IS NOT NULL) UNION (SELECT m.id, m.name FROM $wpdb->pmpro_memberships_pages mp LEFT JOIN $wpdb->pmpro_membership_levels m ON mp.membership_id = m.id WHERE mp.page_id = '" . $post->ID . "')";

        $results = $wpdb->get_results( $sqlQuery );

        if ( ! $results ) {
            $hasaccess = true;
        }

        //  if the user isn't logged-in, restrict content.
        if ( !is_user_logged_in() )  {
            $hasaccess = false;
        }

        $required_levels = array();

        foreach ( $results as $level ) {
            $required_levels[] = $level->id;
        }

        if ( ! empty( $user ) ) {
            $user_levels = pmpro_getMembershipLevelsForUser($user->ID);

            $my_levels = array();
            foreach($user_levels as $curlevel) {
                $my_levels[] = $curlevel->id;
            }
           
          if( count( array_intersect( $my_levels, $required_levels  )  ) > 0 ) {
				//the users membership id is one that will grant access
                $hasaccess = true;
			}  else {
				//user isn't a member of a level with access
				$hasaccess = false;
			}
        }
    }
    
    return $hasaccess;
}
add_filter( 'pmpro_has_membership_access_filter_qpm_form', 'my_restrict_qpm_form_categories', 10, 4  );