function wpf_print_head_scripts() {

    if ( ! is_admin() ) : ?>

        <!-- Chatra {literal} -->
        <script>

            <?php if ( is_user_logged_in() ) : ?>

                <?php $current_user = wp_get_current_user(); ?>

                window.ChatraSetup = {
                    clientId: <?php echo $current_user->ID; ?>
                };

                window.ChatraIntegration = {
                    // main fields
                    name: '<?php echo htmlspecialchars( $current_user->user_firstname . ' ' . $current_user->user_lastname, ENT_QUOTES ); ?>',
                    email: '<?php echo $current_user->user_email; ?>',

                };

            <?php endif; ?>


            ChatraID = 'eJ4iwDrjhx7LacbTE';
            (function(d, w, c) {
                var n = d.getElementsByTagName('script')[0],
                    s = d.createElement('script');
                w[c] = w[c] || function() {
                    (w[c].q = w[c].q || []).push(arguments);
                };
                s.async = true;
                s.src = (d.location.protocol === 'https:' ? 'https:': 'http:')
                    + '//call.chatra.io/chatra.js';
                n.parentNode.insertBefore(s, n);
            })(document, window, 'Chatra');


        </script>
        <!-- /Chatra {/literal} -->

    <?php

}

add_action( 'wp_print_scripts', 'wpf_print_head_scripts' );