header function

[yaffa]

hello every body,how its going??

im buildin a log in page that u write the user name ans password then its direct u to another page i use the header function to accomplish this but its give an warningWarning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\t\login.php:16) in C:\xampp\htdocs\t\login.php on line 38
)
so it only work when i put in the top of the script which make me unable to check if the user logged in and i wanna it inside if statment block so i can check the users login data

so what to do??
thanx

[HalfaBee]

You can use the ob_ functions to buffer the output.
You can the discard unwanted output before sending the header().

If you use sessions, make sure to put a session_write_close() before the header().

[bradgrafelman]

Also note that using the ob_ functions doesn't fix the problem - it simply ignores it at the cost of unnecessary memory/CPU usage on your server.

What you really need to do is figure out what's outputting data on line 16 of login.php (the error message tells you where to look). If you want to send a header on line 38, you can't output data before then.