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Should you use {} for a variable in heredoc

I have just felt the need to use heredoc to display multiple products from the database as it seems easier than trying to fiddle around with "" and ''. But like everything else, I am new to it and just wanted to know if I should use curly braces or not? I tried both ways and it didn't make a difference to what I saw outputted but I saw an example where someone said you should. I just wanted to know why. e.g.:

-$discount%

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vs

-{$discount}%

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0
Black Sulfur
Asked:
Black Sulfur
2 Solutions
 
Ray PaseurCommented:
You need those curly braces when you have quoted array indexes.  If you use object notation, you don't need the curly braces.  Try a couple of things like this and see what you think.  I prefer the object notation, and there are a whole host of other reasons, too advanced to go into now, to use objects instead of arrays whenever possible.
$doc = <<<EOD
Here is the price: $row['price']
EOD;

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$doc = <<<EOD
Here is the price: {$row['price']}
EOD;

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$doc = <<<EOD
Here is the price: $row->price
EOD;

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Marco GasiFreelancerCommented:
No. Curly braces are only required if you use a variable with array notation. For instance
echo <<<HDC
bla bla bla -$discount% bla bla bla {$user['last_name']} bla bla bla

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works perfectly :)
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Julian HansenCommented:
As a side note  I prefer to use {} around all variables - it is a bit of extra typing but it does two things

In my editor I get context colouring on the variable - makes strings easier to read with respect to where variables are.

I think it looks neater in terms of making the variables stand out.

Just my personal preference though.
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