/** * 判断文件是否合法 * @param  $files * @param  $arrCode * @return number|boolean */function checkFileType($files, $arrCode = array()){	$file = @fopen($files['tmp_name'], "rb");	$bin  = @fread($file, 2);	fclose($file);	$str  = @unpack('C2chars', $bin);	$code = intval($str['chars1'].$str['chars2']);	if(! is_array($arrCode))		return $code;	return array_key_exists($code, $arrCode);}//Demo	$arrCode = array(	6063   => 'php',	208207 => 'xls',);//如只允许上传php,和xls文件$result = checkFileType($_FILES['file'], $arrCode);