仿开源中国，分享代码时候的多文件上传

<?php
//http://www.codepearl.com
$action = isset($_GET['action'])?$_GET['action']:"";
require_once('main.class.php');

$auc = new auc();

if ($action == 'uploadfile') {
	$auc = new auc();
	//Comment: $auc->upload_dir("directory name", "create dir if it does not exist, false by default or true");
	//$auc->upload_dir("/path/to/uploads/folder/with/trailing/slash/", false);
	//Comment: $auc->make_safe = true || false (default); make the file name safe
	//$auc->make_safe = true;
	//Comment: $auc->max_file_size = size in bytes (1MB default) || false; set max file size in bytes or false not to check size
	//$auc->max_file_size = 1048576;
	//Comment: $auc->overwrite = true || false (default); overwrite if file exists
	//$auc->overwrite = true;
	//Comment: $auc->check_file_type = false (default) || allowed || denied; 
	//$auc->check_file_type = 'allowed';	
	$result = $auc->upload("file");
	if (is_array($result)) {
		echo 'Something Went Wrong';
		echo '<pre class="brush:php;toolbar:false;">';
		var_dump($result);
		echo '

<?php
//http://www.codepearl.com
class auc {
	public $errors = array(); //array used to store any errors that occur.
	public $upload_dir = ''; //the upload_dir being used by the script
	public $make_safe = false; //default don't modify the file name to safe version
	public $max_file_size = 1048576; //Max File Size in Bytes, 1MB
	public $overwrite = false; //default don't overwrite files that already exsist
	public $check_file_type = false; //don't check for file type by default but can check for allowed and denied files.
	public $allowed_mime_types = array('image/jpeg', 'image/png', 'image/gif', 'image/tiff'); //array of allowed mime types used when check_file_type is set to allowed
	public $denied_mime_types = array('application/x-php', 'text/html'); //array of denied mime types used when check_file_type is set to denied
	
	/**
	 * Check if the upload dir is valid, if it is not valid attempt to make the dir, if dir is succesfully created chmod it to 0777. 
	 * If any elments fail return false else set upload_dir and return true.
	 * @param string $dir
	 * @param boolean $mkdir
	 * @return true or false
	 */
	public function upload_dir($dir, $mkdir = false) {
		$errors =& $this->errors;
		$status = true;
		
		if (!is_dir($dir)) {
			if ($mkdir) {
				if (!mkdir($dir)) {
					$status = false;
				} else {
					if (!chmod($dir, 0777)) $status = false;
				}
			} else {
				$status = false;
			}
		}
		
		if ($status) {
			$this->upload_dir = $dir;
			return true;
		} else {
			$errors['general'][] = 'Upload Dir is Not Valid and/or a dir could not be created/chmod.';
			return false;
		}
	}
	
	/**
	 * check that the upload dir is valid and that it is writeable
	 *
	 * @param string $dir
	 * @return true or false
	 */
	public function check_dir($dir) {
		if (!is_dir($dir) || !is_writable($dir)) return false;
		
		return true;
	}
	

	/**
	 * make the uploaded file name safe
	 *
	 * @param string $file_name
	 * @return safe file name
	 */
	public function make_safe($file_name) {
		return str_replace(' ', '_', $file_name);
	}
		
	/**
	 * Check the Attemted Uploads for errors etc if everything goes good move the file, to the upload_dir.
	 *
	 * @param array $object
	 * @return unknown
	 */
	public function upload($object) {
		$errors =& $this->errors;
		
		if (empty($errors['general'])) {
			if (empty($this->upload_dir)) $this->upload_dir = dirname(__FILE__).'/'; //if no default upload_dir has been specified used the current dir.
					
			if ($this->check_dir($this->upload_dir)) {
				$files = $_FILES[$object];
				$count = count($files['name']) - 1;
				
				echo '<pre class="brush:php;toolbar:false;">';
				var_dump($files);
				echo '