Auto-populate Contact Form 7 select field with active member names [Paid Memberships Pro]

auto-populate-cf7-pmpro-members.php

<?php
/**
 * Auto-populate user names for active members in a field drop-down.
 * This will assume you are using a select field named "membership-list"
 * The value of the select is the user's email and the label is set to the user's login name.
 * Data Example: <option value="someemail@test.com">Test User</option>
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_auto_populate_members ( $tag, $unused ) {  
    global $wpdb;
    
    // Only load it for a field named "membership-list"
    if ( $tag['name'] != 'membership-list' )  {
        return $tag;  
    }
    
    // Get a list of all active members for all membership levels.
    $sql = "SELECT users.user_email, users.user_login FROM $wpdb->pmpro_memberships_users members INNER JOIN $wpdb->users users ON users.ID = members.user_id WHERE `status` = 'active'";

    $member_data = $wpdb->get_results( $sql );
  
    if ( ! $member_data ) {
        return $tag;
    }  

    //Let's get all members.
    foreach ( $member_data as $members ) {  
        $tag['values'][] = $members->user_email; // use the user's email as the value.
        $tag['labels'][] = $members->user_login; // Show the username as the label.  
    }  
  
    return $tag;  
}  
add_filter( 'wpcf7_form_tag', 'my_pmpro_auto_populate_members', 10, 2 );