php-为什么分页不起作用,并在wordpress网站上给出404错误？

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美好的一天！问题是这样的：当您单击404错误的第2页时,在模板类别(档案库)中,分页不起作用.
请帮忙不明白该怎么解决,已经全死了

我的循环：

<?php
$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$arg = array(
  'cat' => get_queried_object_id(),
  'post_type'=>'post',
  'posts_per_page'=>9,
  //'order'=>'desc',
  'paged' => $paged,
  );
$query = new WP_query($arg);
if($query->have_posts()) : ?>
<section class="blog">
  <?php
  echo '<div class="row">';
  $i=0;
  $formcreated=false;
  while( $query->have_posts() ) :
    $query->the_post();
    // display post 
   endwhile;
   wp_reset_postdata();
endif;
?>

<div class="pagination">
  <?php
       if (function_exists('custom_pagination')) {
         custom_pagination($query->max_num_pages,"",$paged);
       }
     ?>
   <?php wp_reset_postdata(); ?>
</div>

和我的自定义分页：

function my_post_queries( $query ) {
    // do not alter the query on wp-admin pages and only alter it if it's the main query
    if (!is_admin() && $query->is_main_query()){

        // alter the query for the home and category pages


        if(is_category()){
            $query->set('posts_per_page', 1);
            $query->set('post_type','product');
        }

    }
}
add_action( 'pre_get_posts', 'my_post_queries' );

function custom_pagination($numpages = '', $pagerange = '', $paged='') {

  if (empty($pagerange)) {
    $pagerange = 2;
  }

  /**
   * This first part of our function is a fallback
   * for custom pagination inside a regular loop that
   * uses the global $paged and global $wp_query variables.
   *
   * It's good because we can now override default pagination
   * in our theme, and use this function in default queries
   * and custom queries.
   */
  global $paged;
  if (empty($paged)) {
    $paged = 1;
  }
  if ($numpages == '') {
    global $wp_query;
    $numpages = $wp_query->max_num_pages;
    if(!$numpages) {
        $numpages = 1;
    }
  }

  /**
   * We construct the pagination arguments to enter into our paginate_links
   * function.
   */
  $pagination_args = array(
    'base'            => get_pagenum_link(1) . '%_%',
    'format'          => 'page/%#%',
    'total'           => $numpages,
    'current'         => $paged,
    'show_all'        => False,
    'end_size'        => 1,
    'mid_size'        => $pagerange,
    'prev_next'       => True,
    'prev_text'       => __('<'),
    'next_text'       => __('>'),
    'type'            => 'plain',
    'add_args'        => false,
    'add_fragment'    => ''
  );

  $paginate_links = paginate_links($pagination_args);

  if ($paginate_links) {
    echo "<nav class='custom-pagination'>";
      echo $paginate_links;
    echo "</nav>";
  }

}

解决方法:

由于最近在两个不同的论坛中都提到了这一点,所以我在回答这个问题.

如果您使用自定义分页,例如您正在使用的自定义分页似乎来自http://callmenick.com/post/custom-wordpress-loop-with-pagination,但它也发生在Genesis子主题中,因为父级分页是什么人.

为什么会显示404页面？在callmenick.com和Genesis(genesis_posts_nav)中的“自定义”分页用于主要查询,因此,如果您对其他查询的分页在您的阅读设置(为主要查询设置)中每页的帖子下,在第2页上获取404.

Every front end page request on a WordPress site produces a main
query. The template that WordPress decides to load is based on the
results of that main query (you can see the order that WordPress does
these things by looking at the Action Reference page). Despite the
fact that you never output the results of that query, it’s still run,
and in the case of paginated archives, this is an issue if you’re
trying to use that pagination for a different query.
— Milo 07001

您不会看到太多这个问题,因为许多人只是为该循环建立分页,而不是从functions.php文件或父主题重新使用它.您可以在这里了解到：https://codex.wordpress.org/Function_Reference/paginate_links

让我们从顶部开始,每当您编写代码时,在wp-config.php中打开调试功能

我的cpt存档中有一个基本的自定义循环.

归档product.php

 <?php $paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;

  $product_args = array(
      'post_type' => 'product',
      'posts_per_page' => 2, //the same as the parse_query filter in our functions.php file
      'paged' => $paged,
      'page' => $paged
    );

  $product_query = new WP_Query( $product_args ); ?>

  <?php if ( $product_query->have_posts() ) : ?>

    <!-- the loop -->
    <?php while ( $product_query->have_posts() ) : $product_query->the_post(); ?>
      <article class="loop">
        <h3><?php the_title(); ?></h3>
        <div class="content">
          <?php the_excerpt(); ?>
        </div>
      </article>
    <?php endwhile; ?>
    <!-- end of the loop -->


    <!-- pagination here -->
    <?php
       if (function_exists( 'custom_pagination' )) :
          custom_pagination( $product_query->max_num_pages,"",$paged );
      endif;
   ?>


  <?php wp_reset_postdata(); ?>

  <?php else:  ?>
    <p><?php _e( 'Sorry, no posts matched your criteria.' ); ?></p>
  <?php endif; ?>

在您的functions.php文件中：

了解条件.
https://codex.wordpress.org/Conditional_Tags
https://codex.wordpress.org/Function_Reference/is_post_type_archive

/** 
 * Posts per page for CPT archive
 * prevent 404 if posts per page on main query
 * is greater than the posts per page for product cpt archive
 *
 * thanks to https://sridharkatakam.com/ for improved solution!
 */

function prefix_change_cpt_archive_per_page( $query ) {

    //* for cpt or any post type main archive
    if ( $query->is_main_query() && ! is_admin() && is_post_type_archive( 'product' ) ) {
        $query->set( 'posts_per_page', '2' );
    }

}
add_action( 'pre_get_posts', 'prefix_change_cpt_archive_per_page' );

/**
 * 
 * Posts per page for category (test-category) under CPT archive 
 *
*/
function prefix_change_category_cpt_posts_per_page( $query ) {

    if ( $query->is_main_query() && ! is_admin() && is_category( 'test-category' ) ) {
        $query->set( 'post_type', array( 'product' ) );
        $query->set( 'posts_per_page', '2' );
    }

}
add_action( 'pre_get_posts', 'prefix_change_category_cpt_posts_per_page' );


/**
*
* custom numbered pagination 
* @http://callmenick.com/post/custom-wordpress-loop-with-pagination
* 
*/
function custom_pagination( $numpages = '', $pagerange = '', $paged='' ) {

  if (empty($pagerange)) {
    $pagerange = 2;
  }

  /**
   * This first part of our function is a fallback
   * for custom pagination inside a regular loop that
   * uses the global $paged and global $wp_query variables.
   * 
   * It's good because we can now override default pagination
   * in our theme, and use this function in default queries
   * and custom queries.
   */
  global $paged;
  if (empty($paged)) {
    $paged = 1;
  }
  if ($numpages == '') {
    global $wp_query;
    $numpages = $wp_query->max_num_pages;
    if(!$numpages) {
        $numpages = 1;
    }
  }

  /** 
   * We construct the pagination arguments to enter into our paginate_links
   * function. 
   */
  $pagination_args = array(
    'base'            => get_pagenum_link(1) . '%_%',
    'format'          => 'page/%#%',
    'total'           => $numpages,
    'current'         => $paged,
    'show_all'        => False,
    'end_size'        => 1,
    'mid_size'        => $pagerange,
    'prev_next'       => True,
    'prev_text'       => __('«'),
    'next_text'       => __('»'),
    'type'            => 'plain',
    'add_args'        => false,
    'add_fragment'    => ''
  );

  $paginate_links = paginate_links($pagination_args);

  if ($paginate_links) {
    echo "<nav class='custom-pagination'>";
      echo "<span class='page-numbers page-num'>Page " . $paged . " of " . $numpages . "</span> ";
      echo $paginate_links;
    echo "</nav>";
  }

}

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