Cannot write session data to file [duplicate]

This question already has an answer here: Closed 10 years ago.

Possible Duplicate:

Failed to write session data

I am having a problem with sessions on my server. Is this a server problem or a coding problem? I get this error message:

Warning: Unknown: Failed to write session data (files). 
Please verify that the cu开发者_运维百科rrent setting of session.save_path 
is correct (/var/php_sessions) in Unknown on line 0

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Most likely either the directory /var/php_sessions does not exist or the php process doesn't have write permissions for it.

What does

$path = '/var/php_sessions';
foreach( array('file_exists', 'is_dir', 'is_readable', 'is_writeable') as $fn ) {
  $rc = $fn($path);
  echo $fn, ': ', $rc ? 'true' : 'false', "<br />\n";
}

print?

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the error message is pretty clear.
PHP cannot write session data into /var/php_sessions directory.
Change this setting to default value

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If you have two sites that you are working on on the same server, that could be your issue. For example, I would run into this issue when developing two separate sites on the same shared host.

Site A:

http://sharedaddress.com/~sitea

Site B:

http://sharedaddress.com/~siteb

The problem is that the sessions would be stored based on the permissions for sharedaddress.com, and not the site I was working on. When I would switch over to the new site, it would be unable to access the session variables, and I would get the permissions error mentioned above.

To solve this issue, I would use the IP address to go there directly (since typically the site was not live yet).