Warning: ScriptBufSize increased to InputBufSize

[Mark PK]

I get the following error with mathop-1.5b16: Warning: ScriptBufSize
increased to InputBufSize
I can reach .html files with a browser. But .php files give me a 505 error.
In the config file I put a line to point to the php executable. I know I
didn't make any typo's. Why do I get an 505 error. And what does 'Warning:
ScriptBufSize increased to InputBufSize' means?