why "permission denied" though chmod 666?

I encountered a very strange problem today.
My PHP script can't open files whose privilege is 666.

Warning: fopen(./home_page/zzm.txt): failed to open stream: Permission denied in /www/index.php on line 294

Warning: fgets(): supplied argument is not a valid stream resource in /www/index.php on line 295

Warning: fclose(): supplied argument is not a valid stream resource in /www/index.php on line 297

Warning: fopen(./home_page/zzm.txt): failed to open stream: Permission denied in /www/index.php on line 298

Warning: fputs(): supplied argument is not a valid stream resource in /www/index.php on line 299

Warning: fclose(): supplied argument is not a valid stream resource in /www/index.php on line 300

Warning: fopen(./home_page/zzm2.txt): failed to open stream: Permission denied in /www/index.php on line 304

Warning: fputs(): supplied argument is not a valid stream resource in /www/index.php on line 305

Warning: fclose(): supplied argument is not a valid stream resource in /www/index.php on line 306

But their privilege is 666 now:
-rw-rw-rw- 1 root root 4484 May 24 21:38 zzm2.txt
-rw-rw-rw- 1 root root 1 May 21 21:29 zzm.txt


can any one help me?

Can you open the file with vi?
You should check the access rights at the directory level and at the filesystem level.

PS : this is not a networking question.

yes.I can edit it via vi.And I am the root.

Probably php security settings then...
I don't know much about php sorry. I hope someone will help, good luck.

What are the permissions in ./home_page ?

666

Make sure the enclosing directories are 755 or 711 or something like that. You need execute permission (the "1" bit) to access the contents of a directory.

I am puzzled.
What is the difference between r and x,if x is need to access the directory?

On a directory, read permissions let you see what files are in that directory, and execute permissions allow you to change into that dirtectory.

Permission in directories:

read: being able to read the context of a directory (doing ls on the directory)
write being able to write a file in the directory
execute being able to enter in the directory (with cd) (write and read have no point without execute).

oh i see
I assume x means run a binary file or shell script

and now I use

chmod a+x /my/directory -R

and it's ok

but I can't use

chmod 666 /my/directory -R

to enable http access to /my/directory

it's funny

check the attributes with 'lsattrib' command

What you can do is just disable SElinux option and try. This might solve your problem. To disable SElinux do:

press ALT+F2. In dialog box write system-config-security and press enter. In security dialog box disable SElinux option. and reboot.