<script>
    function getLikes() {
            $.ajax({
            url: "get_like.php";
            method: "post";
            data: {"get" : "likes"};
            dataType: "json";
            success: function(data){
                $(data).each(function(k, v) {
                    $('[data-id='+v.post_id+']').find('span').text(v.likes);
                });
            }
        });
    }

$(document).ready(function(){
    setInterval(function (){
        getLikes();
    }, 1000);
});
</script>