我正在尝试为自定义帖子表单的附件设置上载。

首先，我将form 标签enctype="multipart/form-data"出于测试目的，我有两个上传表单，但将来我将只实现一个表单，并使用jQuery附加任意多个表单。

    <fieldset class="images">
        <label for="images">Front of the Bottle</label>
        <input type="file" name="image1" id="bottle_front" size="50">
    </fieldset>
    <fieldset class="images">
        <label for="images">Back of the Bottle</label>
        <input type="file" name="image2" id="bottle_rear" size="50">
    </fieldset>

在PHP中，我使用：

    if ($_FILES) {
        foreach ($_FILES as $file => $array) {
            $newupload = insert_attachment($file,$post_id);
            // $newupload returns the attachment id of the file that
            // was just uploaded. Do whatever you want with that now.
        }
    }

和在函数中。我有一些函数可以处理这个表单。

function insert_attachment($file_handler,$post_id,$setthumb=\'false\') {
 // check to make sure its a successful upload
 if ($_FILES[$file_handler][\'error\'] !== UPLOAD_ERR_OK) __return_false();

 require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
 require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
 require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');

 $attach_id = media_handle_upload( $file_handler, $post_id );

 if ($setthumb) update_post_meta($post_id,\'_thumbnail_id\',$attach_id);
 return $attach_id;
 }

如果我只上传两张图片，一切都会正常，但如果我只想上传一张或一张都不想上传，我会收到错误消息my post\\u meta db：

O:8:"WP_Error":2:{s:6:"errors";a:1:{s:12:"upload_error";a:1:{i:0;s:21:"No file was uploaded.";}}s:10:"error_data";a:0:{}}

我尝试插入：if（$\\u FILES[$file\\u handler][“error”]==4）\\uu return\\u false（）；在函数中。php但它不工作，如何告诉我的脚本我的表单是空的？

学分：took this form from here

function insert_attachment($file_handler, $post_id, $setthumb=false) {
    // check to make sure its a successful upload
    // changes start
    if ($_FILES[$file_handler][\'error\'] !== UPLOAD_ERR_OK) {
        return __return_false();
    }
    // changes end

    require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
    require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
    require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');

    $attach_id = media_handle_upload( $file_handler, $post_id );

    if ($setthumb)
        update_post_meta($post_id, \'_thumbnail_id\', $attach_id);
    return $attach_id;
}

\'supports\' => array(\'thumbnail\')