the_post()　WP_Queryのメソッド　WordPress関数　

<?php
public function the_post() {
        global $post;
         $this->in_the_loop = true;

             if ( $this->current_post == -1 ) { // loop has just started
                       
                        do_action_ref_array( 'loop_start', array( &$this ) );
                }
                $post = $this->next_post();
                $this->setup_postdata( $post );
        }

public function next_post() {

                $this->current_post++;

                $this->post = $this->posts[ $this->current_post ];
                return $this->post;
        }

public function setup_postdata( $post ) {
      global $id, $authordata, $currentday, $currentmonth, $page, $pages, $multipage, $more, $numpages;

                if ( ! ( $post instanceof WP_Post ) ) {
                        $post = get_post( $post );
                }

                if ( ! $post ) {
                        return;
                }

                $elements = $this->generate_postdata( $post );
                if ( false === $elements ) {
                        return;
                }

                $id           = $elements['id'];
                $authordata   = $elements['authordata'];
                $currentday   = $elements['currentday'];
                $currentmonth = $elements['currentmonth'];
                $page         = $elements['page'];
                $pages        = $elements['pages'];
                $multipage    = $elements['multipage'];
                $more         = $elements['more'];
                $numpages     = $elements['numpages'];               
                do_action_ref_array( 'the_post', array( &$post, &$this ) );
                return true;
        }
?>