CFile::CheckFile

static function CheckFile($arFile, $intMaxSize=0, $mimeType=false, $strExt=false, $bForceMD5=false, $bSkipExt=false)
{
	if($arFile["name"] == "")
	{
		return "";
	}

	//translit, replace unsafe chars, etc.
	$strFileName = self::transformName($arFile["name"], $bForceMD5, $bSkipExt);

	//transformed name must be valid, check disk quota, etc.
	if(($error = self::validateFile($strFileName, $arFile)) <> '')
	{
		return $error;
	}

	if($intMaxSize > 0 && $arFile["size"] > $intMaxSize)
	{
		return GetMessage("FILE_BAD_SIZE")." (".static::FormatSize($intMaxSize).").";
	}

	$strFileExt = '';
	if($strExt)
	{
		$strFileExt = GetFileExtension($strFileName);
		if($strFileExt == '')
		{
			return GetMessage("FILE_BAD_TYPE");
		}
	}

	//Check mime type
	if($mimeType !== false)
	{
		if(!is_array($mimeType))
		{
			$mimeType = array($mimeType);
		}
		$goodMime = false;
		foreach($mimeType as $strMimeType)
		{
			if(substr($arFile["type"], 0, strlen($strMimeType)) == $strMimeType)
			{
				$goodMime = true;
				break;
			}
		}
		if(!$goodMime)
		{
			return GetMessage("FILE_BAD_TYPE");
		}
	}

	//Check extension
	if($strExt === false)
	{
		return "";
	}

	$IsExtCorrect = true;
	if($strExt)
	{
		$IsExtCorrect = false;
		$tok = strtok($strExt,",");
		while($tok)
		{
			if(strtolower(trim($tok)) == strtolower($strFileExt))
			{
				$IsExtCorrect = true;
				break;
			}
			$tok = strtok(",");
		}
	}

	if($IsExtCorrect)
	{
		return "";
	}

	return GetMessage("FILE_BAD_TYPE")." (".strip_tags($strFileExt).")";
}