How can I learn to use Oracle DB with PHP?

I would like to learn to use Oracle some, just for the sake of learning it. Is there a way to do this without spending a lot of money? I looked on the oracle site and the cheapest thing I saw was this...

Oracle Database Personal Edition

Oracle Database Personal Edition is designed to provide software developers a cost effective, yet full featured Oracle Database environment on which to develop, test and run custom or packaged applications. Designed without technical limits, time bombs or other "gotchas", the Personal Edition provides all the power of the Oracle Database at a very attractive price point. With its ability to handle virtually any type or size of data (from gigabytes of transactions to terabytes of XML data, the Personal Edition takes you a significant step towards mastery of the Oracle environment.

This cost $460 which is insane IMO but is this option ONLY for testing/developing with? Meaning I couldn't actually use it on a s开发者_StackOverflow中文版ite?

Any help with clarifying that or other tips appreciated, thanks

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There's the Oracle Express Edition which is free.

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"is this option ONLY for testing/developing with? Meaning I couldn't actually use it on a site? "

Yes you could use it in production but it is a single person licence, so it is only suited to quite unusual situations. Oh, and it is only available on Windows. Not sure why.

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The rubric on Downloads page qualifies the Developer license with this statement:

All software downloads are free, and each comes with a Development License that allows you to use full versions of the products at no charge while developing and prototyping your applications (or for strictly self-educational purposes). [emphasis mine]

So, if you just want to teach yourself Oracle the OTN license allows us to install any version of the database, even the enterprise one. But if you want to use it for any purpose which might be construed as commercial then you need a license.

I don't think you can use the Personal Edition on a web site either, because I'm pretty sure it's a named user license. As Tor Valamo says, the limited Express Edition is the only cheap Oracle option.