I'm relatively new to PHP.
Previously I used to program a lot in Perl.
What I really lack in PHP is Perl's ability to interpolate any expression inside a string.
For example:

Perl: "Next value is @{[ $value + 1 ]}!"
PHP:  "Next value is " . $value + 1 . "!"

In this simple case it's not a great problem, but it becomes more awkward when using the heredoc operator. In this cases I'm often forced to use temporary variables:

$tempvar = $value + 1;
print <<< END
Here it is the next value

$tempvar

Other text...

END;


I propose to extend the Variable Parsing syntax to evaluate ANY expression instead of variables only.
I propose the following syntax:

print <<< END
Here it is the next value

{$= $value + 1 }

Other text...

END;


Using "{=" would be more readable but it would cause too many backward compatibility problems...

What do you think of this?

Thanks.