我一直在使用前端上传和后期创建脚本。出于某种原因，从“我的项目保存”调用media\\u handle\\u upload函数。php文件作为未定义函数返回。我有什么遗漏吗？权限、其他文件、咖啡？

这是我在函数中的函数。php

function process_attachments() {
    //Process Uploads   
      if (!function_exists(\'wp_generate_attachment_metadata\')){
          require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
          require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
          require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');
      }
       if ($_FILES) {
          foreach ($_FILES as $file => $array) {
              if ($_FILES[$file][\'error\'] !== UPLOAD_ERR_OK) {
                  return "upload error : " . $_FILES[$file][\'error\'];
              }
              $attach_id = media_handle_upload( $file, $post_id );
          }   
      }

      //Attachment ID if set
      if ($attach_id > 0){
          //and if you want to set that image as Post  then use:
          return $attach_id;
      }
}

我从我的项目save中调用这个。php文件（这是精简的，我觉得没有必要显示创建后的表单数据）

$attach_id = process_attachments();
      if($attach_id > 0) {
          //and if you want to set that image as Post  then use:
          $whimkey->attach_id = $attach_id;
      }

自media_handle_upload 是一个Wordpress function 它怎么可能是未定义的？

//if (!function_exists(\'wp_generate_attachment_metadata\')){
          require_once(ABSPATH . \'wp-admin/includes/image.php\');
          require_once(ABSPATH . \'wp-admin/includes/file.php\');
          require_once(ABSPATH . \'wp-admin/includes/media.php\');
      //}