Export WP Users with custom fields

free_custom_export_users.php

<?php

function free_custom_export_users() {
    if ( isset( $_GET['export_my_users'] ) && current_user_can( 'manage_options' ) ) {
        header('Content-Type: text/csv; charset=utf-8');
        header('Content-Disposition: attachment; filename=users_export.csv');
        
        $output = fopen('php://output', 'w');
        
        // Define your column headers here (Add your custom field names)
        fputcsv($output, array('ID', 'Username', 'Email', 'My Custom Field 1', 'My Custom Field 2'));
        
        $users = get_users(array('fields' => 'all'));
        
        foreach ($users as $user) {
            // Fetch your custom field data using the exact meta keys
            $custom_field_1 = get_user_meta($user->ID, 'your_custom_meta_key_1', true);
            $custom_field_2 = get_user_meta($user->ID, 'your_custom_meta_key_2', true);
            
            fputcsv($output, array(
                $user->ID,
                $user->user_login,
                $user->user_email,
                $custom_field_1,
                $custom_field_2
            ));
        }
        fclose($output);
        exit;
    }
}
add_action('admin_init', 'free_custom_export_users');