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Edit File: IterableInForeachRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Arrays;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Rules\RuleError;
use PHPStan\Rules\RuleErrorBuilder;
use PHPStan\Rules\RuleLevelHelper;
use PHPStan\Type\ErrorType;
use PHPStan\Type\Type;
use PHPStan\Type\VerbosityLevel;

class IterableInForeachRule implements \PHPStan\Rules\Rule
{

/** @var \PHPStan\Rules\RuleLevelHelper */
	private $ruleLevelHelper;

public function __construct(RuleLevelHelper $ruleLevelHelper)
	{
		$this->ruleLevelHelper = $ruleLevelHelper;
	}

public function getNodeType(): string
	{
		return \PhpParser\Node\Stmt\Foreach_::class;
	}

/**
	 * @param \PhpParser\Node\Stmt\Foreach_ $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return RuleError[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		$typeResult = $this->ruleLevelHelper->findTypeToCheck(
			$scope,
			$node->expr,
			'Iterating over an object of an unknown class %s.',
			static function (Type $type): bool {
				return $type->isIterable()->yes();
			}
		);
		$type = $typeResult->getType();
		if ($type instanceof ErrorType) {
			return $typeResult->getUnknownClassErrors();
		}
		if ($type->isIterable()->yes()) {
			return [];
		}

return [
			RuleErrorBuilder::message(sprintf(
				'Argument of an invalid type %s supplied for foreach, only iterables are supported.',
				$type->describe(VerbosityLevel::typeOnly())
			))->line($node->expr->getLine())->build(),
		];
	}

}