page-blog.php

<?php
/*
*	Template Name: Blog
*	Displays all published posts, in reverse chronological order. 
*/
get_header(); ?>
<div id="page-blog">
	<?php include('inc/sidebar-check.php')?>
	<?php while ( have_posts() ) : the_post(); ?>
		<?php include('inc/submenu-check.php')?>
			<div class="row">
				<div class="col-sm-<?php echo (is_active_sidebar( $sidebar )?9:12); ?>">
					<div id="primary" class="content-area subpage">
						<main id="main" class="site-main" role="main">
							<?php 
							the_content();
							$cat = get_post_meta( get_the_ID(), 'categories', true );
							$tag = get_post_meta( get_the_ID(), 'tags', true );
							$authornames = get_post_meta( get_the_ID(), 'authors', true );
							$authorsArr = explode(",", $authornames);
							if( array_key_exists(1, $authorsArr) ){
								$authorsStr = '';
								foreach( $authorsArr as $a ){
									$user = get_user_by('slug', $a);
									$id = $user->ID;
									$authorsStr .= $id.',';
								}
								$author = rtrim($authorsStr, ',');
							} else {
								$author = get_user_by('slug', $authornames)->ID;
							}
							$args = array(
								'post_type' => 'post',
								'category_name' => $cat,
								'tag' => $tag,
								'author' => $author,
								'post_status' => 'publish',
								'paged' => get_query_var('paged'),
							);
							if( isset($args) ){
								$pattern = '#[a-zA-Z|~`!@\#$%^&*()_+=|\\}\][{\'/;\-":?>.<]#';
								$arr = array('category_name'=>$cat, 'tag'=>$tag, 'author'=>$author);
								foreach( $arr as $k=>$v ){
									if( empty($v) ){
										continue;
									}
									if( $k == 'author' ){
										$pattern = '#[0-9|~`!@\#$%^&*()_+=|\\}\][{\'/;\-":?>.<]#';
									}
									if( preg_match($pattern, $v) ){
										$args[$k] = $v;
									} else {
										echo '<p>Invalid input in field: "'.$k.'"</p>';
									}
								}
							}
							query_posts( $args );
							if( have_posts() ):
								while( have_posts() ): the_post(); ?>
									<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
										<header class="entry-header">
											<h1><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>
											<p class="text-muted"><?php the_date(); ?></p>
										</header>
										<div class="entry-content">
											<?php the_content(); ?>
										</div>
										<footer class="entry-footer">
											<?php the_tags(); ?>
										</footer>
									</article>
										
								<?php endwhile; ?>
								<nav class="navigation"> <span class="older">
									<?php next_posts_link(__('&laquo; Older','example')) ?>
									</span> <span class="newer">
									<?php previous_posts_link(__('Newer &raquo;','example')) ?>
									</span> 
								</nav>
							<?php else: ?>
								<div id="post-404" class="noposts">
									<p>
										<?php _e('None found.','example'); ?>
									</p>
								</div>
							<?php endif; wp_reset_query(); ?>
						</main>
					</div>
				</div>
				<?php include('inc/sidebar-if-active.php')?>
			</div>
		<?php include('inc/submenu-closing-tags.php')?>
	<?php endwhile; // end of the loop. ?>
</div>
<?php get_footer(); ?>