stristr

I've been trying to make this error logger for hours now, I get my webserver to forward all errors to error.php?message=404 etc.. The source can be found here http://the-bronze.me.uk/ID/error.txt Now Im at my wits end, I want all errors that come internaly eg from the-bronze.me.uk to be put into onserver.txt and all other ones to be put into 404.txt Unfortuantly I seem to be a little lost and confusded, can anyone see where im going wrong as far as my stristr(); usage is and if so what is the problem? Liam