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Edit File: InArrayFunctionTypeSpecifyingExtension.php

<?php declare(strict_types = 1);

namespace PHPStan\Type\Php;

use PhpParser\Node\Expr\FuncCall;
use PHPStan\Analyser\Scope;
use PHPStan\Analyser\SpecifiedTypes;
use PHPStan\Analyser\TypeSpecifier;
use PHPStan\Analyser\TypeSpecifierAwareExtension;
use PHPStan\Analyser\TypeSpecifierContext;
use PHPStan\Reflection\FunctionReflection;
use PHPStan\Type\Constant\ConstantBooleanType;
use PHPStan\Type\FunctionTypeSpecifyingExtension;
use PHPStan\Type\TypeUtils;

class InArrayFunctionTypeSpecifyingExtension implements FunctionTypeSpecifyingExtension, TypeSpecifierAwareExtension
{

/** @var \PHPStan\Analyser\TypeSpecifier */
	private $typeSpecifier;

public function setTypeSpecifier(TypeSpecifier $typeSpecifier): void
	{
		$this->typeSpecifier = $typeSpecifier;
	}

public function isFunctionSupported(FunctionReflection $functionReflection, FuncCall $node, TypeSpecifierContext $context): bool
	{
		return strtolower($functionReflection->getName()) === 'in_array'
			&& count($node->args) >= 3
			&& !$context->null();
	}

public function specifyTypes(FunctionReflection $functionReflection, FuncCall $node, Scope $scope, TypeSpecifierContext $context): SpecifiedTypes
	{
		$strictNodeType = $scope->getType($node->args[2]->value);
		if (!(new ConstantBooleanType(true))->isSuperTypeOf($strictNodeType)->yes()) {
			return new SpecifiedTypes([], []);
		}

$arrayValueType = $scope->getType($node->args[1]->value)->getIterableValueType();

if (
			$context->truthy()
			|| count(TypeUtils::getConstantScalars($arrayValueType)) > 0
		) {
			return $this->typeSpecifier->create(
				$node->args[0]->value,
				$arrayValueType,
				$context
			);
		}

return new SpecifiedTypes([], []);
	}

}