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Edit File: IncompatibleDefaultParameterTypeRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Functions;

use PhpParser\Node;
use PhpParser\Node\FunctionLike;
use PhpParser\Node\Stmt\Function_;
use PHPStan\Analyser\Scope;
use PHPStan\Broker\Broker;
use PHPStan\Reflection\ParametersAcceptorSelector;
use PHPStan\Rules\Rule;
use PHPStan\Rules\RuleError;
use PHPStan\Rules\RuleErrorBuilder;
use PHPStan\Type\VerbosityLevel;

class IncompatibleDefaultParameterTypeRule implements Rule
{

/** @var Broker */
	private $broker;

public function __construct(Broker $broker)
	{
		$this->broker = $broker;
	}

public function getNodeType(): string
	{
		return FunctionLike::class;
	}

/**
	 * @param FunctionLike $node
	 * @param Scope $scope
	 * @return RuleError[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		if (!($node instanceof Function_)) {
			return [];
		}

$name = $node->namespacedName;
		if (!$this->broker->hasFunction($name, $scope)) {
			return [];
		}

$function = $this->broker->getFunction($name, $scope);
		$parameters = ParametersAcceptorSelector::selectSingle($function->getVariants());

$errors = [];
		foreach ($node->getParams() as $paramI => $param) {
			if ($param->default === null) {
				continue;
			}
			if (
				$param->var instanceof Node\Expr\Error
				|| !is_string($param->var->name)
			) {
				throw new \PHPStan\ShouldNotHappenException();
			}

$defaultValueType = $scope->getType($param->default);
			$parameterType = $parameters->getParameters()[$paramI]->getType();

if ($parameterType->isSuperTypeOf($defaultValueType)->yes()) {
				continue;
			}

$errors[] = RuleErrorBuilder::message(sprintf(
				'Default value of the parameter #%d $%s (%s) of function %s() is incompatible with type %s.',
				$paramI + 1,
				$param->var->name,
				$defaultValueType->describe(VerbosityLevel::value()),
				$function->getName(),
				$parameterType->describe(VerbosityLevel::value())
			))->line($param->getLine())->build();
		}

return $errors;
	}

}