If you are using apt-installed PHP under Ubuntu/debian, you may have a small chance of encountering this hint when you use the session.
Copy CodeThe code is as follows:
PHP Notice:session_start (): Ps_files_cleanup_dir:
Opendir (/VAR/LIB/PHP5) Failed:permission denied (13)
in/home/laruence/www/htdocs/index.php on line 22
This is because, in PHP, if File_handler is used as the session's save handler, then there is a probability that the GC process of the session will run every time session_start.
Copy CodeThe code is as follows:
Have omitted
int nrdels =-1;
Nrand = (int) ((float) PS (gc_divisor) * PHP_COMBINED_LCG (Tsrmls_c));
if (Nrand < PS (gc_probability)) {
PS (MoD)->s_gc (&ps (Mod_data), PS (gc_maxlifetime), &nrdels tsrmls_cc);
}
Have omitted
The reason for this warning is that in apt PHP, the default directory for session/VAR/LIB/PHP5 is 733 with sticky bit, which is
Copy CodeThe code is as follows:
DRWX-WX-WT Root Roo
In general, PHP workers are running in a non-root identity, so there is no permission to open this folder (but because can write, so does not affect the normal session file read). The following code in the S_GC, then, triggers the notice at the beginning:
Copy CodeThe code is as follows:
For file handler, S_GC indirectly calls Ps_files_cleanup_dir:
dir = Opendir (dirname);
if (!dir) {
Php_error_docref (NULL tsrmls_cc, E_notice,
"Ps_files_cleanup_dir:opendir (%s) failed:%s (%d)",
DirName, Strerror (errno), errno);
return (0);
}
Of course, under the Ubuntu/debian, there are GC recycling, but the external cron process to complete, the default in/ETC/CRON.D/PHP5:,
Copy CodeThe code is as follows:
09,39 * * * * root [-x/usr/lib/php5/maxlifetime]
&& [-D/VAR/LIB/PHP5] && find/var/lib/php5/
-type f-cmin +$ (/usr/lib/php5/maxlifetime)-print0
| Xargs-n 200-r-0 R
In addition, you can see that there are two key variables when judging whether S_GC is running: PS (gc_divisor) and PS (gc_probability), which correspond to two configuration items with the same name for the runtime configuration item of the session, respectively:
Session.gc_probability and Session.gc_divisor, they default to 1 and 100 respectively.
The PHP_COMBINED_LCG is a random number generator that generates random numbers ranging from 0 to 1, so the above discriminant is equivalent to:
Copy CodeThe code is as follows:
Rand < Probability/gc_diviso
That is, by default, it is almost 100 times that a GC process can be called. So that's the small probability that you can see this notice.
To close this notice, just set:
session.gc_probability = 0, so that S_GC is not running at all possible.
Of course, you can also change the permissions of this folder ...
Finally, thank cfc4n for providing this question.
Author: laruence ()
This address: http://www.laruence.com/2011/03/29/1949.html
http://www.bkjia.com/PHPjc/323187.html www.bkjia.com true http://www.bkjia.com/PHPjc/323187.html techarticle If you use apt-installed PHP under Ubuntu/debian, you may have a small chance of encountering this hint when using the session. Copy the code code as follows: PHP Notice:session_start () ...
