按条款显示自定义帖子

问题描述

想法是我想在WP的前端显示具有特定术语的自定义帖子，但是我很难使用foreach循环来获取特定分类法的term_id。我m using fresh WP installation and I正在研究二十二十个主题。

因此，首先我在我的function.php中创建自定义帖子类型“设备”，然后我创建了带有术语“新”，“二手”，“颜色”，“ wb”的分类法“ copy_device”。因此，我想显示所有“新彩色复印设备”，而不是“二手彩色复印设备”。

我想在前端显示带有特定术语的自定义帖子类型，所以我做了下面的代码。但是我什么也没得到。。。如果我在page.php中删除if语句“ if（$ terms &&！is_wp_error（$ terms））{”，则会收到错误消息“警告：/（。中为foreach（）提供了无效参数。 。）/ public_html / wp-content / themes / twentytwenty / page.php，第43行“

数组 （ ）

第43行是“ foreach（$ terms as $ term）{”

FUNCTION.php

function td_devices_posttype() {
 $labels = array(
     'name'                => _x( 'Devices','Post Type General Name','textdomain' ),'singular_name'       => _x( 'Device','Post Type Singular Name','menu_name'           => esc_html__( 'Devices','parent_item_colon'   => esc_html__( 'Parent Device','all_items'           => esc_html__( 'All Devices','view_item'           => esc_html__( 'View Devices','add_new_item'        => esc_html__( 'Add New Devices','add_new'             => esc_html__( 'Add New','edit_item'           => esc_html__( 'Edit Devices','update_item'         => esc_html__( 'Update Devices','search_items'        => esc_html__( 'Search Devices','not_found'           => esc_html__( 'Not found','not_found_in_trash'  => esc_html__( 'Not found in Trash','textdomain' )
 );
 $args = array(
     'label'               => esc_html__( 'devices','description'         => esc_html__( 'All devices you have','labels'              => $labels,'taxonomies'          => array( 'copy_device'),'hierarchical'        => false,'public'              => true,'show_ui'             => true,'show_in_menu'        => true,'show_in_nav_menus'   => true,'show_in_admin_bar'   => true,'menu_position'       => 100,'can_export'          => true,'has_archive'         => esc_html__( 'devices' ),'exclude_from_search' => false,'publicly_queryable'  => true,'query_var'           => true,'show_admin_column'   => true,'capability_type'     => 'post','rewrite'             => array('slug' => 'devices'),'supports'            => array( 'title','editor','thumbnail','custom-fields')
 );
 register_post_type( 'devices',$args );
}
add_action( 'init','td_devices_posttype' );

// custom taxonomies Copy devices
function td_posttype_taxonomy() {
    $labels = array(
        'name'                  => 'Copy Devices','singular_name'         => 'Copy Device','search_items'          => 'Search items','all_items'             => 'All items','parent_item'           => 'Parent item','parent_item_colon'     => 'Parent item colon:','edit_item'             => 'Edit item','update_item'           => 'Update item','add_new_item'          => 'Add new item','new_item_name'         => 'New item name','menu_name'             => 'Copy Devices'
    );

    $args = array (
        'hierarchical'          => true,'labels'                => $labels,'show_ui'               => true,'show_admin_column'     => true,'show_in_rest'          => true,'query_var'             => true,'rewrite'               => array( 'slug' => 'copy-device')
    );

    register_taxonomy( 'copy_device',array( 'devices' ),$args );
}
add_action('init','td_posttype_taxonomy');

在PAGE.php中，我有以下代码：

            // trying to hook terms ID`s (Not working?)
            $termID = array();
            $terms = get_the_terms($post->ID,'copy_device');


            if ( $terms && ! is_wp_error( $terms ) ){
              foreach ( $terms as $term ) {
                $termID[] = $term->term_id;
              }
              echo '<pre>'; print_r(array_values($termID)); echo '</pre>';
            }

            // Loop and return terms
            foreach ( $categories as $categorie ):

                // set up a new query
                $args = new WP_Query(
                    array(
                        'post_type' => 'devices','tax_query' => array(
                            array(
                                'taxonomy'          => 'copy_device','terms'             => array( 'new','colour' ),'field'             => 'slug','hide_empty'        => false,)
                        )
                    )
                );
            ?>

            <h3><?php echo $categorie->name; ?></h3>
            <ul>
            <?php while ($args->have_posts()) : $args->the_post(); ?>
                <li><?php the_title(); ?></li>
            <?php endwhile; ?>
            </ul>

            <?php
                $args = null;
                wp_reset_postdata();
              endforeach;
            ?>

如果我执行以下操作：

              array(
                'taxonomy'    => esc_html__('copy_device'),'hide_empty'  => true,)
            );?>

我得到：

Array
(
[0] => WP_Term Object
(
[term_id] => 12
[name] => BW
[slug] => bw
[term_group] => 0
[term_taxonomy_id] => 12
[taxonomy] => copy_device
[description] =>
[parent] => 9
[count] => 1
[filter] => raw
)

[1] => WP_Term Object
(
[term_id] => 11
[name] => Colour
[slug] => colour
[term_group] => 0
[term_taxonomy_id] => 11
[taxonomy] => copy_device
[description] =>
[parent] => 9
[count] => 1
[filter] => raw
)

[2] => WP_Term Object
(
[term_id] => 9
[name] => New
[slug] => new
[term_group] => 0
[term_taxonomy_id] => 9
[taxonomy] => copy_device
[description] =>
[parent] => 0
[count] => 2
[filter] => raw
)

[3] => WP_Term Object
(
[term_id] => 10
[name] => Used
[slug] => used
[term_group] => 0
[term_taxonomy_id] => 10
[taxonomy] => copy_device
[description] =>
[parent] => 0
[count] => 1
[filter] => raw
)
)

我花了很多天的时间来完成这项工作。我正在阅读法典，论坛，网站，并尝试了不同的方法，但是我失败了……是否有任何铁杆成员可以帮助我完成这项工作？

解决方法

使用此代码：

$args = array( 'post_type' => 'devices');

$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
$terms = get_the_terms(  get_the_id(),'taxonomy');
foreach ( $terms as $term ) {
    $termID[] = $term->term_id;
}
echo $termID[0]; `
endwhile;


`

,

什么是$ categories？ foreach错误可能是由此引起的。我认为您不需要在循环内调用WP_Query。删除（$ categories as $ categorie）的foreach循环，WP_Query将返回带有新术语和颜色术语的设备。另外，税务查询中没有'hide_empty'参数，您也可以将其删除。

,

对不起，我得到这样的$个类别：

<?php
            // get all devices
            $categories = get_terms(
              array(
                'taxonomy'    => esc_html__('copy_device'),'hide_empty'  => true,)
            );?>