使用cmb2插件，我创建了一个具有textarea元字段的元盒，方法如下：

function myprefix_register_metabox() {

  $prefix = \'myprefix_\';

  $cmb = new_cmb2_box( array(
    \'id\'            => $prefix . \'metabox\',
    \'title\'         => esc_html__( \'My Metabox\', \'cmb2\' ),
    \'object_types\'  => array( \'page\' ),
  ) );

  $cmb->add_field( array(
    \'name\'            => esc_html__( \'Text Area for Code\', \'cmb2\' ),
    \'id\'              => $prefix . \'textarea_code\',
    \'type\'            => \'textarea_code\',
    \'sanitization_cb\' => \'my_sanitize_text_callback\',
  ) );

}
add_action( \'cmb2_admin_init\', \'myprefix_register_metabox\' );

我使用此回调函数清理元字段内容：

function my_sanitize_text_callback( $value, $field_args, $field ) {

    $value = htmlentities( html_entity_decode( $value, ENT_QUOTES ), ENT_QUOTES );

    return $value;
}

一切正常，但如何查看存储在db中的textarea的内容以及转换的实体html_entity_decode() 在“管理”面板的“编辑”屏幕中，要获取更具可读性的文本？

  $cmb->add_field( array(
    \'name\'            => esc_html__( \'Text Area for Code\', \'cmb2\' ),
    \'id\'              => $prefix . \'textarea_code\',
    \'type\'            => \'textarea_code\',
    \'sanitization_cb\' => \'my_sanitize_text_callback\',
    \'escape_cb\'       => \'my_escape_text_callback\'
  ) );

function my_escape_text_callback( $value, $field_args, $field ) {

    $escaped_value = html_entity_decode( $value, ENT_QUOTES );

    return $escaped_value;

}