I have xml field :
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<field name="show_title" type="radio" default="1" label="MOD_TESTIMONIAL_SHOW_TITLE_LABEL" description="MOD_TESTIMONIAL_SHOW_TITLE_DESC" class="btn-group btn-group-yesno">
<option value="1">MOD_TESTIMONIAL_SHOW_TITLE_SHOW</option>
<option value="0">MOD_TESTIMONIAL_SHOW_TITLE_HIDE</option>
</field>
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$show_title = modTestimonialHelper::getShowTitle($params);
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function getShowTitle(&$params){
$show_title = $params->get( 'show_title' );
}
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<?php if($show_title == 1) : ?>
<h2 class="text-center mt-5 mb-5 pb-2 text-uppercase text-dark"><strong><?php echo JText::_('MOD_TESTIMONIAL_TITLE'); ?></strong></h2>
<?php endif; ?>