czar

In fact, it works now. I’m sorry to trouble Guust.
ciao

Yes Guust, of course, there is only one

<?php 
/*#############################################
HERE YOU CAN ADD YOUR OWN FUNCTIONS OR REPLACE FUNCTONS IN THE PARENT THEME
#############################################*/

// Here we defind the textdomain for the child theme, if changing you should also replace it in the function below. 
if (!defined('GDF_CHILD')) define('GDF_CHILD', 'gdf_child');	

add_action('after_setup_theme', 'gdfc_theme_setup');
function gdfc_theme_setup(){
   // load_child_theme_textdomain( GDF_CHILD, get_stylesheet_directory() . '/languages' ); // uncomment this if you plan to use translation
}

add_filter('geodir_detail_page_sidebar_content' , 'geodir_detail_page_sidebar_content') ;

function geodir_detail_page_sidebar_content($section_array)
{
	if(!empty($section_array) && is_array($section_array))
	{
		foreach($section_array as $key=>$value)
		{
			if($value=='geodir_social_sharing_buttons' || $value=='geodir_share_this_button')
				unset($section_array[$key]) ;
		}
	}
	
	return $section_array ;
}
?>

@Vikas: I added this code in function.php of child-theme, but it does not work. thanks