WordPress post view counter

gistfile1.aw

// update view count for a post
function update_post_views($postID=0) {
	$view_count = get_post_meta($postID, '_view_count', true);
	if(!$view_count) $view_count = 0;
	update_post_meta($postID, '_view_count', $view_count+1);
}

// usage within loop:
<?php update_post_views($post->ID); ?>

// query:
$query = new WP_Query(array(
	'post_type'	 => 'post',
	'posts_per_page' => '4',
	'meta_key'	 => '_view_count',
	'orderby'	 => 'meta_value'
));
while($query->have_posts()) : $query->the_post();