Fatal error: Class PDO not foundΒΆ

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:


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