[str_replace Help!]

I am trying to make sure that all line breaks in a piece of text are converted to \r\n.  When I use the code below for:

 

a

b

c

 

$text = str_replace(array("\r\n","\r","\n"), "\r\n", $text);

 

 

After using mysql_real_escape_string the output shows:

 

a\r\r\n\r\nb\r\r\n\r\nc

 

Where am I going wrong? I expected it to remain at a\r\nb\r\nc

 

If I use $text = str_replace(array("\r\n","\r","\n"), "\r", $text); , it works.