rector/rules/DeadCode/NodeManipulator/VariadicFunctionLikeDetector.php

<?php

declare (strict_types=1);
namespace Rector\DeadCode\NodeManipulator;

use PhpParser\Node;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\FunctionLike;
use PhpParser\NodeTraverser;
use Rector\NodeNameResolver\NodeNameResolver;
use Rector\PhpDocParser\NodeTraverser\SimpleCallableNodeTraverser;
final class VariadicFunctionLikeDetector
{
    /**
     * @readonly
     * @var \Rector\PhpDocParser\NodeTraverser\SimpleCallableNodeTraverser
     */
    private $simpleCallableNodeTraverser;
    /**
     * @readonly
     * @var \Rector\NodeNameResolver\NodeNameResolver
     */
    private $nodeNameResolver;
    /**
     * @var string[]
     */
    private const VARIADIC_FUNCTION_NAMES = ['func_get_arg', 'func_get_args', 'func_num_args'];
    public function __construct(SimpleCallableNodeTraverser $simpleCallableNodeTraverser, NodeNameResolver $nodeNameResolver)
    {
        $this->simpleCallableNodeTraverser = $simpleCallableNodeTraverser;
        $this->nodeNameResolver = $nodeNameResolver;
    }
    /**
     * @api
     */
    public function isVariadic(FunctionLike $functionLike) : bool
    {
        $isVariadic = \false;
        $this->simpleCallableNodeTraverser->traverseNodesWithCallable((array) $functionLike->getStmts(), function (Node $node) use(&$isVariadic) : ?int {
            if (!$node instanceof FuncCall) {
                return null;
            }
            if (!$this->nodeNameResolver->isNames($node, self::VARIADIC_FUNCTION_NAMES)) {
                return null;
            }
            $isVariadic = \true;
            return NodeTraverser::STOP_TRAVERSAL;
        });
        return $isVariadic;
    }
}