PDO or OCI for php/oracle

I skimmed through the 'oracle underground manual' and it said the oci method is prefered. but i was wondering doesn't PDO use some sort of OCI libraries/functions anyway, aka maybe even the same ones?
aka if you use PDO for oracle, does it internally though abstraction use php's oci_connect() to connect to your oracle database?
so basically im also asking... when u enable pdo and its oci .dll...
extension=php_pdo.dll
extension=php_pdo_mysql.dll
extension=php_pdo_oci.dll
Is the php_pdo_oci.dll just an interface to interact with php's oci functions. Just thought I'd ask cause it seems like they are separate, but i read somewhere pdo uses oci libraries not sure exactly what that means since you have options of oci or pdo and that statement sounds like the technologies merge/overlap a little (at least from pdo's side).

PDO will emulate parsing for the drivers that do not support them? What good does that do to me? If I want transparent use of the database, I could always use abstraction classes like ADOdb. PDO is is largely untested and unfinished and doesn't even allow you to get the cursor metadata and get the names and the data types of the columns in your query.
To clarify further, PDO will only emulate the prepare statement, it will not do anything for the statement portability. Statements that reference oracle specific functions or "CONNECT BY" will still fail to execute against MySQL, even if PDO is used. So far, my advice is to stay away from PDO.

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See Re: PHP- Oracle not working- Call to undefined function OCILogon() ERROR

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PDO or OCI for php/oracle

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