functions.php dosyasına eklenecek kodlar:

add_action('wp_ajax_nopriv_ayas-begen', 'begen');
	add_action('wp_ajax_ayas-begen', 'begen');

	wp_enqueue_script('makale_begen', get_template_directory_uri().'/js/begen.js', array('jquery'), '1.0', true );
	wp_localize_script('makale_begen', 'ajax_var', array(
		'url' => admin_url('admin-ajax.php'),
		'nonce' => wp_create_nonce('ajax-nonce')
	));
	

	$begen_zaman_sayaci = 1440; // 1 gün
	function begen(){
		$nonce = $_POST['nonce'];
	  
		if ( ! wp_verify_nonce( $nonce, 'ajax-nonce' ) )
			die ( 'Busted!');
		 
		if(isset($_POST['begen']))
		{
			$ip = $_SERVER['REMOTE_ADDR'];
			$post_id = $_POST['post_id'];
			 
			$meta_IP = get_post_meta($post_id, "voted_IP");
			$voted_IP = $meta_IP[0];
	 
			if(!is_array($voted_IP))
				$voted_IP = array();
			 
			$meta_count = get_post_meta($post_id, "votes_count", true);
	 
			if(!begen_kontrol($post_id))
			{
				$voted_IP[$ip] = time();
	 
				update_post_meta($post_id, "voted_IP", $voted_IP);
				update_post_meta($post_id, "votes_count", ++$meta_count);
				 
				echo $meta_count;
			}
			else
				echo "already";
		}
		exit;
	}
	function begen_kontrol($post_id)
	{
		global $begen_zaman_sayaci;
	 
		$meta_IP = get_post_meta($post_id, "voted_IP");
		$voted_IP = $meta_IP[0];
		 
		if(!is_array($voted_IP))
			$voted_IP = array();
			 
		$ip = $_SERVER['REMOTE_ADDR'];
		 
		if(in_array($ip, array_keys($voted_IP)))
		{
			$time = $voted_IP[$ip];
			$now = time();
			 
			if(round(($now - $time) / 60) > $begen_zaman_sayaci)
				return false;
				
			return true;
		}
		return false;
	}


	function ayasBegen($post_id){

		$begenme_sayisi = get_post_meta($post_id, "votes_count", true);
		$cikis = '<div class="makaleBegen"><a href="#" data-post_id="'.$post_id.'"><i class="fa fa-heart"></i>';
		if(begen_kontrol($post_id))
			$cikis .= '<p>Beğendin</p>';
		else
			$cikis .= '<p>Beğen !</p>';
		
		if($begenme_sayisi != 0 || $begenme_sayisi != null)
			$cikis .= '<span class="begeniSayisi">('.$begenme_sayisi.')</span>';
		else
			$cikis .= '<span class="begeniSayisi">'.$begenme_sayisi.'</span>';
		$cikis .= '</a></div>';
		return $cikis;
	}

temanızın js klasörüne begen.js adında dosya açıp şunları yazın:

jQuery(document).ready(function(){jQuery(".makaleBegen a").click(function(){return kalp=jQuery(this),post_id=kalp.data("post_id"),jQuery.ajax({type:"post",url:ajax_var.url,data:"action=ayas-begen&nonce="+ajax_var.nonce+"&begen=&post_id="+post_id,success:function(a){"already"!=a&&(kalp.addClass("voted"),kalp.find("p").html("Beğendin !"),kalp.find(".begeniSayisi").html("("+a+")"))}}),!1})});

Daha sonra kullanmak istediğin sayfaya şunu ekleyin (single.php):

<?php echo ayasBegen(get_the_ID());?>