hide 'Add Friend' in BuddyPress when a user does not have an active membership with Paid Memberships Pro.

hide_add_friend_button_pmpro.php

<?php
/**
 * Hide 'Add Friend' button in BuddyPress if a user does not have an active membership level.
 * Add this code to your PMPro Customizations plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * Visit www.paidmembershipspro.com
 */

function pmpro_hide_add_friend_if_non_member( $button ) {
    
    if ( pmpro_hasMembershipLevel() ) { //if the user has a membership level, show the 'add friend button'.
        return $button;
    }

    return "";
}
add_filter( 'bp_get_add_friend_button', 'pmpro_hide_add_friend_if_non_member' );