Old configuration at the PDO installation page

From the manual page: https://php.net/pdo.installation

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1. Extensions don't need to be declared with file extensions anymore (both Unix and Windows). Examples:

Old:

extension=pdo_sqlite.so

Old:

extension=pdo_sqlite.dll

New:

extension=pdo_sqlite

2. Extensions don't need to be declared with the php_ prefix (both Unix and Windows). Examples:

Old:

extension=php_pdo_sqlite

Example (newer way):

extension=pdo_sqlite

As mentioned by @cmb69, the newer syntax is supported after PHP 7.2.