PhpParser\PrettyPrinter\Standard::pScalar_Encapsed PHP Method

    protected function pScalar_Encapsed(Scalar\Encapsed $node) {
        if ($node->getAttribute('kind') === Scalar\String_::KIND_HEREDOC) {
            $label = $node->getAttribute('docLabel');
            if ($label && !$this->encapsedContainsEndLabel($node->parts, $label)) {
                if (count($node->parts) === 1
                    && $node->parts[0] instanceof Scalar\EncapsedStringPart
                    && $node->parts[0]->value === ''
                ) {
                    return $this->pNoIndent("<<<$label\n$label") . $this->docStringEndToken;
                }

                return $this->pNoIndent(
                    "<<<$label\n" . $this->pEncapsList($node->parts, null) . "\n$label"
                ) . $this->docStringEndToken;
            }
        }
        return '"' . $this->pEncapsList($node->parts, '"') . '"';
    }