php functions new php developers should be aware of

Posted by John on Stack Overflow See other posts from Stack Overflow or by John
Published on 2010-03-28T16:02:26Z Indexed on 2010/03/28 16:03 UTC
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Can people suggest a list of common or popular php functions that new/junior programmers should be aware of so that they don't "re-invent-the-wheel" so to speak?

For example, I've seen a lot of new coders try to write their own date parsing functions when a combination of date(), strtotime() and time() can do everything their looking for.

Any other ones you guys want to add to this list?

Thanks

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