我正试图通过以下教程向我的主题添加自定义元框：https://www.sitepoint.com/adding-meta-boxes-post-types-wordpress/.

我可以看到meta框，它从数据库中获取值（通过手动更新post meta进行尝试）。然而，它从未得到更新。我尝试通过var\\u dump（ing）调试$_POST 数组，它显示变量值为空，但该值存在于$_REQUEST. 有人知道原因吗？

调用缺少的变量post-excerpt.这是我的密码。

function buziness_add_custom_box() {
// Adding layout meta box for page
 add_meta_box(
    \'offer-post-excerpt\',
    esc_html__( \'Excerpt\', \'buziness\'),
    \'buziness_post_excerpt\',
    \'post\',
    \'normal\',
    \'default\'
 );
}

接下来是回调函数：

function buziness_post_excerpt($post){
// Add a nonce field so we can check for it later
// Use nonce for verification
wp_nonce_field( basename( __FILE__ ) , \'custom_excerpt_nonce\' );

$value = get_post_meta($post->ID, \'_excerpt\', true );

echo \'<textarea style="width:100%" id="post_excerpt" name="post_excerpt">\' . esc_attr( $value ) . \'</textarea>\';
echo "<p>Excerpts are optional hand-crafted summaries of your content that can be used in your theme</p>";

}

这是连接到的函数save_post 钩

add_action(\'save_post\', \'buziness_save_post_excerpt\');
/**
* save the custom excerpt metabox data
* @hooked to save_post hook
*/
function buziness_save_post_excerpt($post_id) {
    // Checks save status

    var_dump($_POST);
    var_dump($_REQUEST);
    wp_die($_REQUEST);
    $is_autosave = wp_is_post_autosave( $post_id );

    $is_valid_nonce = ( isset( $_POST[ \'custom_excerpt_nonce\' ] ) && wp_verify_nonce( $_POST[ \'custom_excerpt_nonce\' ], basename( __FILE__ ) ) ) ? \'true\' : \'false\';

    // Exits script depending on save status
    if ( $is_autosave || !$is_valid_nonce ) {
       return;
    }

    // Check the user\'s permissions.
    if ( isset( $_POST[\'post_type\'] ) && \'post\' == $_POST[\'post_type\'] ) {

        if ( ! current_user_can( \'edit_page\', $post_id ) ) {
           return;
       }

   }
   else {

        if ( ! current_user_can( \'edit_post\', $post_id ) ) {
            return;
        }
   }


   // Checks for input and sanitizes/saves if needed
   if( isset( $_POST[ \'post_excerpt\' ] ) ) {
       update_post_meta( $post_id, \'_excerpt\', sanitize_text_field( $_POST[ \'post_excerpt\' ] ) );
   }
}

以下是var_dump($_POST)

\'ping_status\' => string \'open\' (length=4)
\'add_comment_nonce\' => string \'c641d598b3\' (length=10)
\'_ajax_fetch_list_nonce\' => string \'1e9f1f3f06\' (length=10)
\'post_name\' => string \'online-training\' (length=15)
\'post_author_override\' => string \'1\' (length=1)
\'custom_excerpt_nonce\' => string \'0cd0a833c4\' (length=10)
\'post_excerpt\' => string \'\' (length=0)
\'post_mime_type\' => string \'\' (length=0)
\'ID\' => int 96

以及var_dump($_REQUEST)

\'ping_status\' => string \'open\' (length=4)
\'add_comment_nonce\' => string \'c641d598b3\' (length=10)
\'_ajax_fetch_list_nonce\' => string \'1e9f1f3f06\' (length=10)
\'post_name\' => string \'online-training\' (length=15)
\'post_author_override\' => string \'1\' (length=1)
\'custom_excerpt_nonce\' => string \'0cd0a833c4\' (length=10)
\'post_excerpt\' => string \'TES t \' (length=6)

正如您所看到的，\'post_excerpt\' 的输出中为空$_POST.