PHP/MySQL replacing letters in text

[webdev]

Hi everyone. I need some help again with PHP and MySQL. Here is what I would like to do: // Example retrieved text from DB = Axxxax xaxx. Cxxax xbxxx. Bxxx .... $text = All letters in $text have been replaced where A=&nnn; a=&mmm; B=&uuu; etc. mysql_query("UPDATE Ads1 SET Text...