Question

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curly braces in string

Just came across this piece of code and it got me curious…

$msg .= "–{$mime_boundary}–n";   

The $mime_boundary var was specified earlier to be output as a string.

Did a quick test….

$var = "XmytextX";
$str ="some wrapper{$var}end of";
echo $str; 

and it does indeed output into the string. I’ve just never seen this way of outputting a var before.

Couldn’t find any documentation on it – can anyone enlighten me?

Answer 1

So, normally, you could use the double quotes to output any variable like so:

echo "Hello, $name";

But, what if you wanted to output an item inside an array?

echo "Hello, $row['name']";

That wouldn’t work. So, you would enclose the variable in curly brackets to tell the compiler to interpolate the entire variable:

echo "Hello, {$row['name']}";

On that note, you could also use it with objects:

echo "Hello, {$row->name}";

Hope that helps!