psalm/src/Psalm/Internal/Analyzer/Statements/Expression/EncapsulatedStringAnalyzer.php

<?php
namespace Psalm\Internal\Analyzer\Statements\Expression;

use PhpParser;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Context;
use Psalm\Type;

class EncapsulatedStringAnalyzer
{
    public static function analyze(
        StatementsAnalyzer $statements_analyzer,
        PhpParser\Node\Scalar\Encapsed $stmt,
        Context $context
    ) : bool {
        foreach ($stmt->parts as $part) {
            if (ExpressionAnalyzer::analyze($statements_analyzer, $part, $context) === false) {
                return false;
            }

            if ($statements_analyzer->node_data->getType($part)) {
                CastAnalyzer::castStringAttempt($statements_analyzer, $context, $part);
            }
        }

        $statements_analyzer->node_data->setType($stmt, Type::getString());

        return true;
    }
}