SEO on Page : Mengatasi Duplicate Meta Tag Title dan Description pada Wordpress

function the_desc(){
 global $post;
 $weit = mysql_query("select meta_value from hx_postmeta where post_id=".$post->ID." and meta_key='elangsakti_text'");
 $wood = mysql_fetch_array($weit);
 echo $wood['meta_value'];
}

<meta name="description" content="<?php if($paged>1) echo "Page ".$paged." "; if(is_single()){ the_desc(); }else{ wp_title($sep = '' ); echo " | "; bloginfo( 'name' ); echo " # "; bloginfo( 'description' ); } ?>" />

function this_url(){
 echo "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
}

<link rel="canonical" href="<?php this_url(); ?>" />
<meta property="og:url" content="<?php this_url(); ?>" />

// mengambil list tag
function this_tags(){
  $ptags = get_the_tags();
  foreach($ptags as $ptag){
    echo ", ".$ptag->name;
  }
}

// mengambil list category
function this_cats(){
  $pcats = get_the_category();
  foreach($pcats as $pcat){
    echo ", ".$pcat->name;
  }
}

<meta name="keywords" content="<?php echo "Keyword default1, keyword default2, keyword default3, dst "; this_tags(); this_cats(); ?>" />