I tried to copy my site to a new sever and since id did that, I get an HTTP-Fehler 500 (Internal Server Error): on certain pages. The log files are reporting:

PHP Fatal error:  Call to undefined function chdir() in /var/customers/webs/something/includes/bootstrap.inc on line 3384
PHP Fatal error:  Call to undefined function max() in /var/customers/webs/something/includes/lock.inc on line 106

I cleared all caches many times with:

drush cc all

and also flushed the cache tables directly with MySQL commands. I disabled APC. I don't think, that this is a problem with the server, because it serves well for other Durpal sites.

EDIT: Here are my php.ini and htaccess.

  • 1
    Is the new server or vhost in PHP safe mode? What does status report say? – mpdonadio Jun 13 '13 at 1:13
  • What's your php version, by the way? Even in safe mode chdir is defined, so @MPD suggestion does not explain it all - but is a good starting point. And max is plainly safe. – Mołot Jun 13 '13 at 6:48
  • @MPD The server is a vhost and PHP is in safe mode. But the status report does not complain for safe mode restrictions and I get no Drupal error messages either. – user5950 Jun 13 '13 at 8:39

chdir() and max() are built in functions that always exists in PHP. They are in no plugin, just a core. Even in safe mode both should be defined.

There is one way to disable them and make them non-existent from the script's point of view. disable_functions section in php.ini does the trick. Usually it is used for safety, like this:


and whilst I can see some illusionary* safety in disabling chdir(), disabling max() must have been a mistake. Note that on some configurations you can alter ini settings in .htaccess and via ini_set() too.

*Illusionary due to the same reasons that made Safe Mode deprecated.

  • Thank you for clarify that, but the functions mentioned above are not disabled in php.ini or elsewhere. – user5950 Jun 13 '13 at 8:40
  • @user5950 So what's your PHP version? Anyway if there is safe mode at all, you are using pretty old PHP version. Could you post your php.ini and .htaccess? – Mołot Jun 13 '13 at 8:46
  • PHP Version 5.3.24-1. I posted the files above. – user5950 Jun 13 '13 at 9:39
  • @user5950 nothing that could block these functions there. Weird. Can you output phpinfo() ? – Mołot Jun 13 '13 at 10:08
  • Finally I found the cause of that problem: I get those or similar messages when the server runs out of memory. – user5950 Jul 9 '13 at 12:54

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