Twig Template

The default Twig template is FOSCKEditorBundle:Form:ckeditor_widget.html.twig. This one has some blocks you can override according to your needs.

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{# app/Resources/views/Form/ckeditor_widget.html.twig #}
{% extends 'FOSCKEditorBundle:Form:ckeditor_widget.html.twig' %}

{% block ckeditor_widget_extra %}
    CKEDITOR.dtd.$removeEmpty['span'] = false;
{% endblock %}

Then, just need to register your template as a form resources in the configuration and it will override the default one:

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# app/config/config.yml
twig:
    form_themes:
        - "::Form/ckeditor_widget.html.twig"

PHP Template

The default PHP template is FOSCKEditorBundle:Form:ckeditor_widget.html.php. This one has some slots you can override according to your needs.

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<!-- app/Resources/views/Form/ckeditor_widget.html.php -->
<?php $view->extend('FOSCKEditorBundle:Form:ckeditor_widget.html.php') ?>

<?php $view['slots']->start('ckeditor_widget_extra') ?>
    CKEDITOR.dtd.$removeEmpty['span'] = false;
<?php $view['slots']->stop() ?>

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# app/config/config.yml
framework:
    templating:
        form:
            resources:
                - "::Form"