a lot of http process initiated by the server itself??..
 

here is a piece of netstat -an:

there are nearly 150 of them. what could they be? is it result of bad php programming?

any help appreciated.

Do the processes belong to the same session ID?
(ps -eo pid,sid,uid,command -f -U apache) where apache is the username
Do the processes have PIDs attached? (netstat -ntp|grep httpd)
Can you see for those PIDs which files they have open?
Any of those open files in temp dirs or other odd locations?
(lsof -w -n -p $PID) where $PID is a PID out of your netstat list?
Does Apache's access and error log (and PHP's error_log) (or syslog) show any weirdness?

yes, they do. as far as I see however.

they do not have any PID. and as long as I could monitor them, they were in TIME_WAIT condition. what could that mean?

lot of programming issues. lot of 404 errors. logs grow up very quickly. however programmers do not correct those errors. this is very wierd I'd say. but nothing else as far as I see.

why web-server could need this kind of connection to itself?