<ul>
<?php
	//URLパラメータ取得
	$yget = isset($_GET['y']) ? htmlspecialchars($_GET['y']) : null;

	//年度別アーカイブリスト
	$archives_year = strip_tags(wp_get_archives('type=monthly&show_count=0&format=custom&echo=0'));
	$archives_year = split("\n",$archives_year);
	$archives_year = preg_replace("/(\d{4})年1月/ue","'\\1'-1",$archives_year);
	$archives_year = preg_replace("/(\d{4})年2月/ue","'\\1'-1",$archives_year);
	$archives_year = preg_replace("/(\d{4})年3月/ue","'\\1'-1",$archives_year);
	$archives_year = preg_replace("/年\d{1,2}月/","",$archives_year);
	$archives_year = array_filter($archives_year);
	$archives_year = array_unique($archives_year);
	$archives_year = array_values($archives_year);
	if(empty($yget)){
		foreach($archives_year as $year_value){
			echo '<li><a href="'.home_url('/').'history/?y='.$year_value.'">'.$year_value.'年度</a></li>';
		}
	}
?>
</ul>


<?php //記事一覧
	if(!empty($yget)){ ?>
	<h2><?php echo $yget; ?>年度の記事一覧</h2>
	<dl>
		<?php
		$paged = get_query_var('paged') ? get_query_var('paged') : 1;
		$start = $yget.'/4/1';
		$end = ($yget+1).'/3/31 23:59:59';
		$args = array(
			'post_type' => 'post',
			'posts_per_page' => 10,
			'paged' => $paged,
			'date_query' => array(
				'after' => $start,
				'before' => $end,
			),
		);

		$the_query = new WP_Query( $args );
		if ( $the_query->have_posts() ) :
		while ( $the_query->have_posts() ) : $the_query->the_post();
			$date = get_the_date('Y-m-d');
		?>

			<dd><?php the_title(); ?>（<?php echo $date; ?>）</dd>

		<?php
		endwhile;
		endif;
		?>
	</dl>
	<?php if(function_exists('wp_pagenavi')) { wp_pagenavi(array('query' => $the_query)); } ?>
<?php } ?>