PHP上传多个文件代码帮助

我有一些代码在我的网站上运行，它可以很好地从文件输入表单元素上传单个文件-但我现在需要一个多文件输入表单元素来接受超过1个文件，并将它们全部上传到服务器，并存储以逗号分隔的字符串上传的文件名的详细信息…关于如何使用我下面使用的代码使此工作的任何想法:

表单字段:

<input name="logoexamples[]" id="blogoexamples" type="file" class="textInput" value="notrelevant" multiple>

PHP代码(可以接受1个文件上传，但不超过1个....?):

<?php
// initialize output;
$output = true;
// valid extensions
$ext_array = array('pdf', 'txt', 'doc', 'docx', 'rtf', 'jpg', 'jpeg', 'png', 'eps', 'svg', 'gif', 'ai');
// create unique path for this form submission
//$uploadpath = 'assets/uploads/';
// you can create some logic to automatically
// generate some type of folder structure here.
// the path that you specify will automatically
// be created by the script if it doesn't already
// exist.
// UPLOAD TO FOLDER IN /ASSETS/UPLOADS/ WITH ID OF THE PARENT PROJECT FOLDER RESOURCE 
// Get page ID
// $pageid = $modx->resource->get('id');
// $uploadpath = 'assets/uploads/'.$pageid.'/';
// Get parent page title
$parentObj = $modx->resource->getOne('Parent');
$parentpageid = $parentObj->get('pagetitle');
$uploadpath = 'assets/uploads/'.$parentpageid.'/';
// get full path to unique folder
$target_path = $modx->config['base_path'] . $uploadpath;
// get uploaded file names:
$submittedfiles = array_keys($_FILES);
// loop through files
foreach ($submittedfiles as $sf) {

// Get Filename and make sure its good.
$filename = basename( $_FILES[$sf]['name'] );
// Get file's extension
$ext = pathinfo($filename, PATHINFO_EXTENSION);
$ext = mb_strtolower($ext); // case insensitive
// is the file name empty (no file uploaded)
if($filename != '') {
    // is this the right type of file?
    if(in_array($ext, $ext_array)) {
        // clean up file name and make unique
        $filename = mb_strtolower($filename); // to lowercase
        $filename = str_replace(' ', '_', $filename); // spaces to underscores
        $filename = date("Y-m-d_G-i-s_") . $filename; // add date & time
        // full path to new file
        $myTarget = $target_path . $filename;
// JWD - save uploaded filenames as a session var to get it on the redirect hook
$_SESSION['briefing_submittedfiles_' . $sf] = 'http://www.example.com/assets/uploads/'.$parentpageid.'/'.$filename;

        // create directory to move file into if it doesn't exist
        mkdir($target_path, 0755, true);
        // is the file moved to the proper folder successfully?
        if(move_uploaded_file($_FILES[$sf]['tmp_name'], $myTarget)) {
            // set a new placeholder with the new full path (if you need it in subsequent hooks)
            $modx->setPlaceholder('fi.'.$sf.'_new', $myTarget);
            // set the permissions on the file
            if (!chmod($myTarget, 0644)) { /*some debug function*/ }
        } else {
            // File not uploaded
            $errorMsg = 'There was a problem uploading the file.';
            $hook->addError($sf, $errorMsg);
            $output = false; // generate submission error
        }
    } else {
        // File type not allowed
        $errorMsg = 'Type of file not allowed.';
        $hook->addError($sf, $errorMsg);
        $output = false; // generate submission error
    }
// if no file, don't error, but return blank
} else {
    $hook->setValue($sf, '');
}
}
return $output;