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Zubrag.com :: Forum > zubrag.com > Questions About Our Scripts > Password Protect > Warning: Cannot modify header information
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Author Topic: Warning: Cannot modify header information  (Read 5596 times)
zubrag
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« on: December 10, 2007, 05:14:03 am »
A lot of people receiving "Cannot modify header information" error, so i decided to explain it.

Warning: Cannot modify header information - headers already sent by (output started at /home/ahdiorg/public_html/members_area.php:1) in /home/ahdiorg/public_html/pass_protect/ahdi_password_protect.php on line 138

Such error means your script is sending some output before password protector takes control.

Look at your error message.
1. Find the part which is in red color above. This is the name of the program which is causing problems.
2. Find the part which is in green color above. This is the line number in the program which is causing problems.

In above example members_area.php does output something in line 1.

Open program you found on step 1. Make sure protection string is added at the very beginning of the file. It must be first line, no spaces or any other characters allowed before the <?php ...
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gpd
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Posts: 1
« Reply #1 on: April 12, 2009, 01:22:30 pm »
I am experiencing this issue.  I have checked the code several times and can't figure out why it is still doing this.  It is the very first line of code on my page with no spaces or characters before the <?php ... do you have any other suggestions?
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recoding
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« Reply #2 on: May 06, 2009, 05:56:49 am »
Hello gdp, Are you still experiencing these issues?
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Kara
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Posts: 7
« Reply #3 on: August 17, 2009, 02:44:21 am »
I am also experiencing this problem.  I have double and triple checked the code, there is definately no characters between the start of the first line of code that shouldnt be there.

Please help!
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Kara
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Posts: 7
« Reply #4 on: August 29, 2009, 08:37:27 am »
I STILL haven't fixed this.... really need help.

Are these forums even moderated anymore???
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AllMyTrash
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Posts: 1
« Reply #5 on: September 27, 2009, 12:08:53 am »
I was having this problem and I discovered my problem. The password_protect.php file had a space at the beginning of the file. The first character apparently has to be the < in the <?php command. So, not only does the user page have to begin with the <?php include line, the php file itself can't have anything before the <?php text.
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Kara
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Posts: 7
« Reply #6 on: February 10, 2010, 03:49:54 am »
None of this has helped me, I still have this issue.

I managed to fix it on one of my .php pages but deleting the <html> bit at the start of the page, but it worked for one area and not the other.

Grrr this is so annoying!  It's affecting my logout page also, and my logout link has stopped working.

Using Micrsoft Expression Web 3 and Internet Explorer 8, although also had these problems on previous Expression Web and IE versions.
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Kara
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Posts: 7
« Reply #7 on: February 10, 2010, 04:01:41 am »
Ok I have fixed it.... 

Make sure you don't have the <html> header and </html> footer in your files, INCLUDING the passwordprotect.php file  That's what was doing it for me.  All fixed now including my logout links, and also fixed having to login when clicking each link.

Yay
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writerguyfl
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Posts: 1
« Reply #8 on: March 11, 2010, 01:40:15 am »
I was running into this error and was getting very frustrated.  I checked and rechecked and everything should have worked.  I finally figured out that it wasn't a problem with the script.  Instead, it was a problem with my text editor.  Apparently some text editor add phantom characters to files.  (Don't ask me why or how.)  Here's how I solved my error:

I copy/pasted the code from the file that was causing the problem into Notepad.  Then, I saved file with the appropriate extension (.php, for example).  Once I uploaded that file to the server, the error disappeared.

No guarantee this solution will work for you; but, it's a very simple (& free) thing to try.  FYI: I was coding in Dreamweaver 8.
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