[PHP] Extension problem

I use php without problem, but my file is processed by php only if the extension is .php , why ? If I have for example a index.html with "

[PHP] Mail fifth parameter

I have to send a email to a server where is very important the "Return-Path" to match the identity. If I use mail("[EMAIL PROTECTED]", "object", $message,"From: [EMAIL PROTECTED]". "Reply-To:[EMAIL PROTECTED]" ."Return-Path: [EMAIL PROTECTED]); I see in the received message that return-path Is

[PHP] Error compiling php

During compilation of php4 I have this: What I have to do ? Thanks, Enrico DXML_BYTE_ORDER=12 -g -O2 -c sapi_apache.c sapi_apache.c:32: httpd.h: No such file or directory sapi_apache.c:33: http_config.h: No such file or directory sapi_apache.c:41: http_core.h: No such file or directory sapi_a