implemented fopen mode constants
diff --git a/system/codeigniter/Common.php b/system/codeigniter/Common.php
index 05720a4..b6a4ce4 100644
--- a/system/codeigniter/Common.php
+++ b/system/codeigniter/Common.php
@@ -46,7 +46,7 @@
 	{

 		$file = rtrim($file, '/').'/'.md5(rand(1,100));

 		

-		if (($fp = @fopen($file, 'ab')) === FALSE)

+		if (($fp = @fopen($file, FOPEN_WRITE_CREATE_EOF)) === FALSE)

 		{

 			return FALSE;

 		}

@@ -56,7 +56,7 @@
 		@unlink($file);

 		return TRUE;

 	}

-	elseif (($fp = @fopen($file, 'ab')) === FALSE)

+	elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE_EOF)) === FALSE)

 	{

 		return FALSE;

 	}