I have worked with computer and programming for all my life and never seen such a good meant product peroform so badly. You dont care that PHP is one of the worlds most used script languages? No one will use your products if it costs the webhotel-owners hundreds of thousands in migration and quirks...
God damn, I will go back to Windows and IIS, and aspx. It costs, but god damn - it works... and someone bothered to check it up too.