投稿ナンバリング

posts_numbering.php

<?php
function sequential_posts_numberting( $post_type  = 'post', $posts_per_page = -1, $post_status = 'publish' ) {
$posts_keys = array();
$args       = array(
    'post_type'      => $post_type,
    'posts_per_page' => $posts_per_page,
    'post_status'    => $post_status,
  );
  $sequential_posts  = get_posts( $args );
  if( ! empty( $sequential_posts ) ) {
    foreach( $sequential_posts as $key => $sequential_post ) {
      $posts_keys[$key] = $sequential_post->ID;
    }
  }
  $post_id        = get_the_ID();
  $post_position  = array_search( $post_id, array_reverse( $posts_keys ) );
  $post_position += 1;
 
  return intval( $post_position );
}