Cara nampilin logo kecil saat share berita

Assalamualaikum,.. itu muncul dari favicon pada webnya abangku :
<link rel="icon" type="image/png" href="<?= base_url('assets/img/favicon.png') ?>">

Assalamualaikum,.. 
teriamaksih atas informasinya min, mhoon dibantu jika ingin kita munculin di cms swarakalibata kita pasang di template.php atau detailberita.php ya. dan scriptnya apakah hanya itu saja. 
 
terimakasih 

Assalamualaikum,.. beirkut source codenya di template.php, tetap tidak bisa muncul logo icon web saat dishare ke wa
 
 
	<?php 
		if($this->uri->segment(1)=='agenda' && $this->uri->segment(2) == 'detail') {
			$rows = $this->model_utama->view_where('agenda',array('tema_seo' => $this->uri->segment(3)))->row_array();
			$gambar_url = 'asset/foto_agenda/'.$rows['gambar'];			
			$content_url = 'agenda/detail/'. $rows['tema_seo'];
		} else {
			$rows = $this->model_utama->view_where('berita',array('judul_seo' => $this->uri->segment(1)))->row_array();
			$gambar_url = 'asset/foto_berita/'.$rows['gambar'];
			$content_url = $this->uri->segment(1);
		}
 
		if( !empty($rows) ) {
			?>
			<meta property="og:title" content="<?php echo $title;?>" />
			<meta property="og:type" content="article" />
			<meta property="og:url" content="<?php echo base_url($content_url);?>" />
			<meta property="og:image" content="<?php echo base_url($gambar_url);?>" />
			<meta property="og:description" content="<?php echo $description;?>"/>
		<?php
		} 
	?>
 
	<link rel="shortcut icon" href="<?php echo base_url(); ?>asset/images/<?php echo favicon(); ?>" />