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OOP Shopping Cart m_template.php line 39 - Why no period?


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Quick question:

Why are there no periods bordering this php insertion?

header("Location: $url");

I would expect it to look like this:

header("Location: . $url . ");

My guess, reading W3Schools and elsewhere is that both would amount to the same thing.  

I have to wonder though, it they amount to the same thing, why ever use the periods?  -Seems like more work.

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