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What's the deal with curly braces around variables


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I see quite a lot of code on these forums that does the same thing but is written differently...

e.g. When referencing a GET variable in PHP I use $_GET['name'].  If I try and use this exact var in a heredoc it doesn't work, I have to drop the single quotes and use $_GET[name], now I've also seen people put it as {$_GET['name']}.

Now I can't find anything about these curly braces in the manual and I'd like to try and work to some kind of a standard, so does anyone have an explanation or can you point me to the page in the manual where it's listed?

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