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Almost literally converted from the PHP manual[1].
[1] https://www.php.net/manual/en/internals2.pdo.php
Obviously, these docs are out-dated; there are mentions of PDO version 0.3 and PHP 5.1, and TSRM_* macros in the signatures. This needs to be reviewed.
There is also some info which is already covered by the internals book, and thus should be removed (replaced with respective links).
I'm also not familiar with reStructuredText; likely some stuff could be marked up better.
Any help welcome!