function exportleads_settings(){
    add_submenu_page(
        'options-general.php',
        __( 'Export Popup Leads', 'consumeracquision' ),
        __( 'Export Popup Leads', 'consumeracquision' ),
        'manage_options',
        'export-popup-feeds',
        'exportleads_callback'
    );
}
add_action('admin_menu', 'exportleads_settings'); 
function exportleads_callback() { 
    ?>
    

    

    Export Popup Leads
    
    prefix.'leads';
        $users = $wpdb->get_results( $sql, 'ARRAY_A' );
        $i=1;
        foreach ( $users as $user ) {
            fputcsv($file, array($i, $user['email']  ) );
            $i++;
        }
        exit();
}