仿开源中国，分享代码时候的多文件上传

有点标题党，不过确实是一个不错的多文件上传类。简洁实用。 这个类可以用来处理表单上传多个文件。 这个类可以检查文件是否不为空，也没有超过给定的大小限制。 它也可以检查文件类型对允许和拒绝的文件类型列表。 该类还可以通过用下划线代替空格使最终的文

有点标题党，不过确实是一个不错的多文件上传类。简洁实用。
这个类可以用来处理表单上传多个文件。

这个类可以检查文件是否不为空，也没有超过给定的大小限制。

它也可以检查文件类型对允许和拒绝的文件类型列表。

该类还可以通过用下划线代替空格使最终的文件名更安全。

如果在上传文件时出现错误，类抛出一个异常对象，该对象提供有关错误代码和说明错误消息的信息。
代码珠玑：http://www.codepearl.com/files/194.html

源码与演示：源码出处 演示出处

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 '
';
		var_dump($result);
		echo '
';
	} else {
		echo 'All OK';
	}
} else {
?>

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 '
';
				var_dump($files);
				echo '
';
				
				for ($current = 0; $current max_file_size) {
							if ($files['size'][$current] >= $this->max_file_size) 
								throw new TrigerErrorException($files['name'][$current].' exceeds defined max_file_size', $files['name'][$current]);
						}
						
						if ($this->check_file_type == 'allowed' && !in_array($files['type'][$current], $this->allowed_mime_types)) {
							throw new TrigerErrorException($files['name'][$current].' is not an allowed type', $files['name'][$current]);
						} elseif ($this->check_file_type == 'denied' && in_array($files['type'][$current], $this->denied_mime_types)) {
							throw new TrigerErrorException($files['name'][$current].' is a denied type', $files['name'][$current]);
						}
						
						//if make_safe is true call make safe function		
						if ($this->make_safe)
							$files['name'][$current] = $this->make_safe($files['name'][$current]);
						
						//if overwrite is false and the file exists error
						if (!$this->overwrite && file_exists($this->upload_dir.$files['name'][$current]))
							throw new TrigerErrorException($files['name'][$current].' already exsists', $files['name'][$current]);
							
						//move the uploaded file, error if anything goes wrong.
						if (!move_uploaded_file($files['tmp_name'][$current], $this->upload_dir.$files['name'][$current]))
							throw new TrigerErrorException($files['name'][$current].' could not be moved', $files['name'][$current]);
					} catch (TrigerErrorException $e) {
						$errors[$files['name'][$current]][] = $e->Message();
					}
				}
				
				if (empty($errors)) {
					//return true if there where no errors
					return true;
				} else {
					//return the errors array if there where any errros
					return $errors;
				}
			} else {
				//return false as dir is not valid
				$errors['general'][] = "The Specified Dir is Not Valid or is Not Writeable";
				return false;
			}
		}
	}	
}

/**
 * Handle the Exceptions trigered by errors within upload code.
 *
 */
class TrigerErrorException extends Exception {
	protected $file = "";
	public function __construct($message, $file = "", $code = 0) {
		$this->file = $file;
   		parent::__construct($message, $code);
	}

  	public function Message() {
		return "{$this->message}";
   	}
}
?>