Fatal error: Class PDO


Class PDO not found

If you encounter the error Fatal error: Class 'PDO' not found when the OSE Firewall is activated, this indicates the Class ‘PHP Data Objects’ is not loaded in your PHP environment. You can do a check to confirm if the class exists.

1 Make a new php file in your site root directory with name check_pdo.php.

2 Put the below codes into the file:

  if (extension_loaded('pdo')) {
  echo "PDO is installed.";
  } else {
  echo "PDO is NOT installed.";

3 Run the script on the site through the URL: http://your_site_domain/check_pdo.php and it will show the PDO status.

PDO is activated by default as of PHP 5.1.0, so if it’s disabled please contact your hosting company to enable it.

Reference: http://www.php.net/manual/en/pdo.installation.php

If you manage the server or know how to customize the PHP configurations, please edit the php.ini file to add the following codes into it:

extension = pdo.so
extension = pdo_mysql.so

Once PDO is added to the PHP environment, issue will be resolved.


Connection failed:SQLSTATE[HY000] [2002] No such file or directory. Fatal error: Call to amember function prepare() on a non-object

If you encounter this error, it means the PDO MySQLsocket might be missing on your server. Please upload an info.php file to the server with the codes:


Run the script through: http://your_site_domain/info.php to check the server PHP settings.

Search for mysql.default_socket,and you could find its value is /var/run/mysqld/mysqld.sock.

Then search for pdo_mysql.default_socket. It always returns a different value, for example /tmp/mysql.sock. This is where the problem is. This directory might be missing or un-writable. The solution is to edit your server PHP settings to define:

pdo_mysql.default_socket = /var/run/mysqld/mysqld.sock

Or please contact your host for the help if you are not allowed to change PHP settings on the server.