这个multiple="multiple" 或multiple="" 输入文件标记的属性是相当新的，在跨浏览器中不受广泛支持，但如果您想这样做，

尝试以下操作：

<form  ...
   <input type="file" id="image" name="image[]" onchange="updateList();" multiple="multiple" >
   <ul id="file_list"></ul>
</form>
<script>
function updateList(){
    //get the input and UL list
    var input = document.getElementById(\'image\');
    var list = document.getElementById(\'file_list\');

    //empty list for now...
    while (list.hasChildNodes()) {
      list.removeChild(ul.firstChild);
    }

    //for every file...
    for (var x = 0; x < input.files.length; x++) {
      //add to list
      var li = document.createElement(\'li\');
      li.innerHTML = \'File \' + (x + 1) + \':  \' + input.files[x].name;
      list.append(li);
    }
}
</script>

现在，上载文件时，您需要对阵列使用修复程序才能使用该功能，因此请从Golden Apples

function fix_file_array(&$files) {
    $names = array(
        \'name\' => 1,
        \'type\' => 1,
        \'tmp_name\' => 1,
        \'error\' => 1,
        \'size\' => 1
    );
    foreach ($files as $key => $part) {
        // only deal with valid keys and multiple files
        $key = (string) $key;
        if (isset($names[$key]) && is_array($part)) {
            foreach ($part as $position => $value) {
                $files[$position][$key] = $value;
            }
            // remove old key reference
            unset($files[$key]);
        }
    }
}


function insert_attachment($file_handler,$post_id,$setthumb=\'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_sideload( $file_handler, $post_id );
    if ($setthumb) update_post_meta($post_id,\'_thumbnail_id\',$attach_id);
    return $attach_id;
}

一旦你有了这个功能，你就可以这样做：

if ($_FILES) {
    fix_file_array($_FILES[$name]);
    foreach ($_FILES[$name] as $file => $fileitem){
        $newupload = insert_attachment($fileitem,$real_post_id);
    }
}

哪个应该有效