WordPress AJAX loop template

<?php
// Our include
define('WP_USE_THEMES', false);
require_once('../../../wp-load.php');
 
// Our variables
$numPosts = (isset($_GET['numPosts'])) ? $_GET['numPosts'] : 0;
$page = (isset($_GET['pageNumber'])) ? $_GET['pageNumber'] : 0;
$catSlug = (isset($_GET['catSlug'])) ? $_GET['catSlug'] : 0;
 
$count = 0;
 
global $query_string;
$args = wp_parse_args($query_string);
 
if($catSlug=='all'){
	$args = array(
		'post_type' => 'post',
		'paged' => $page, 
		'posts_per_page' => $numPosts,
		'post_status' => 'publish',
		);
}else{
	$args = array(
		'category_name' => $catSlug,
		'post_type' => 'post',
		'paged' => $page, 
		'posts_per_page' => $numPosts,
		'post_status' => 'publish',
		);
}
?>
 
<?php $wp_query = new WP_Query( $args ); ?>
 
<?php 
$totalposts = $wp_query->post_count;
while ($wp_query->have_posts()) : $wp_query->the_post();
$count++;
?>
 
<article id="post-<?php the_ID(); ?>" <?php post_class('clearfix'); ?> role="article" itemscope itemtype="http://schema.org/BlogPosting">
 
	<header class="article-header">
 
		<div class="date"><?php print get_the_time('j-m-Y'); ?></div>
 
		<h1 class="news-title"><?php the_title(); ?></h1>
 
		<?php 
		$postid = get_the_ID();
		?>
 
		<p class="byline vcard">
			Posted in <?php echo get_cats($postid); ?> by <?php echo get_the_author(); ?>
		</p>
 
	</header> <!-- end article header -->
 
	<section class="entry-content clearfix" itemprop="articleBody">
		<?php the_content(); ?>
	</section> <!-- end article section -->
 
</article> <!-- end article -->
 
<?php
endwhile;       
wp_reset_query();
?>