String manipulation, optimize

Is it best to use double quotes and let PHP expand variables inside strings,
or is it faster to do the string manipulation yourself manually?

Which is quicker?

1)
$insert = 'To Be';
$sentence = "$insert or not $insert. That is the question.";

or
2)
$insert = 'To Be';
$sentence = $insert . ' or not ' . $insert . '. That is the question.';


Small thing, but might as well get it right.

Thanks
/Rune


.

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