rector/rules/DeadCode/NodeAnalyzer/UsedVariableNameAnalyzer.php

<?php

declare(strict_types=1);

namespace Rector\DeadCode\NodeAnalyzer;

use PhpParser\Node;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\Variable;
use Rector\NodeNameResolver\NodeNameResolver;

final class UsedVariableNameAnalyzer
{
    /**
     * @var NodeNameResolver
     */
    private $nodeNameResolver;

    public function __construct(NodeNameResolver $nodeNameResolver)
    {
        $this->nodeNameResolver = $nodeNameResolver;
    }

    public function isVariableNamed(Node $node, Variable $variable): bool
    {
        if (($node instanceof MethodCall || $node instanceof PropertyFetch) && ($node->name instanceof Variable && is_string(
            $node->name->name
        ))) {
            return $this->nodeNameResolver->isName($variable, $node->name->name);
        }

        if (! $node instanceof Variable) {
            return false;
        }

        return $this->nodeNameResolver->areNamesEqual($variable, $node);
    }
}