Как разобраться со структурой работы CMS и всеми вытекающими

<?php
    if( $ctype['options']['list_show_filter'] ) {
        $this->renderAsset('ui/filter-panel', array(
            'css_prefix'   => $ctype['name'],
            'page_url'     => $page_url,
            'fields'       => $fields,
            'props_fields' => $props_fields,
            'props'        => $props,
            'filters'      => $filters,
			'ext_hidden_params' => $ext_hidden_params,
            'is_expanded'  => $ctype['options']['list_expand_filter']
        ));
    }
?>
<?php if ($items){ ?>
 
	<?php $this->addCSS('templates/default/css/content/ВАШ_СТИЛЬ.css'); ?>
 
	<div class="default_list_my <?php echo $ctype['name']; ?>_list_my">
 
		<?php foreach($items as $item){ ?>
			<?php
				$item['ctype'] = $ctype;
                $item['ctype_name'] = $ctype['name'];
				$url = href_to($ctype['name'], $item['slug']) . '.html';
				$big_url = '/templates/default/images/nophoto_big.png';
				if(isset($item['fields']['photo']) && !empty($item['photo'])) { 
					$big_url = html_image_src($item['photo'], 'big', true);
				}
			?>			
			<div class="item_my">
 
				<div class="image_my">
					<img src="<?php html($big_url); ?>)" alt="<?php html($item['title']); ?>" title="<?php html($item['title']); ?>" />
					</a>
				</div>
 
				<div class="fields_my">
					<div class="fields_title_my">
						<a href="<?php echo $url; ?>" title="<?php html($item['title']); ?>"><?php html($item['title']); ?></a>
					</div>
					<div class="fields_info_my">
						<?php if ($fields['date_pub']['is_in_list']){ ?>
							<span class="date_my">
								<?php html(string_date_age_max($item['date_pub'], true)); ?>
							</span>
						<?php } ?>
						<?php if ($fields['user']['is_in_list']){ ?>
							<span class="user_my">
								<a href="<?php echo href_to('users', $item['user_id']); ?>" rel="nofollow"><?php html($item['user']['nickname']); ?></a>
							</span>
						<?php } ?>
						<?php if ($ctype['is_comments'] && $item['is_comments_on']){ ?>
							<span class="comment_my" title="<?php echo LANG_COMMENTS; ?>">
								<?php echo intval($item['comments']); ?>
							</span>
						<?php } ?>
					</div>
					<?php if (!empty($item['content']) && $fields['content']['is_in_list']){ ?>
						<div class="content_my">
							<?php html(mb_strimwidth(strip_tags($item['content']), 0, 200, "...")); ?>
						</div>
					<?php } ?>
				</div>
 
			</div>
		<?php } ?>
	</div>
 
    <?php if ($perpage < $total) { ?>
        <?php echo html_pagebar($page, $perpage, $total, $page_url, array_merge($filters, $ext_hidden_params)); ?>
    <?php } ?>
 
<?php } else {
 
    if(!empty($ctype['labels']['many'])){
        echo sprintf(LANG_TARGET_LIST_EMPTY, $ctype['labels']['many']);
    } else {
        echo LANG_LIST_EMPTY;
    }
 
}