Plugin-php: Pretty output double quotes strings

[alexander-akait]

We have two syntax:

• Easy

$string = "Foo ${bar}";

• Complex (curly) syntax

$string = "Foo {$bar}";

Ref: http://php.net/manual/en/language.types.string.php

Should we:

1. Output encapsed string as is.
2. Output always into complex (curly) syntax.

[czosel]

I'd leave them the way we find them for now, because for complex expressions the two styles have different meaning. That requires https://github.com/glayzzle/php-parser/issues/101 to be implemented though.

[czosel]

I'll close this for now since there is a PR for the parser feature now :smile: