<ul>
<?php
query_posts('posts_per_page=-1&meta_key=講演者');
while(have_Posts()) :
the_post();
$speaker = get_post_meta($post->ID, '講演者', true);
?>
<li><a href="<?php the_permalink() ?>"><?php echo $speaker ?></a></li>
<?php
endwhile;
wp_reset_query();
?>
</ul>
未検証
function posts_limit() {
global $userdata, $post_type, $wpdb;
if ( $post_type === 'ポストタイプ' ) {
$item_count = $wpdb->get_var( "SELECT count(*) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'ポストタイプ' AND post_author = $userdata->ID" );
if ( $item_count >= '制限数' ) { wp_die( "エラーメッセージ" ); }
}
return;
}
add_action('admin_head-post-new.php', 'posts_limit');
functions.php 未検証