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Edit File: ArrayKeyExistsFunctionTypeSpecifyingExtension.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\Accessory\HasOffsetType;
use PHPStan\Type\ArrayType;
use PHPStan\Type\FunctionTypeSpecifyingExtension;
use PHPStan\Type\MixedType;
use PHPStan\Type\TypeCombinator;

class ArrayKeyExistsFunctionTypeSpecifyingExtension 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 $functionReflection->getName() === 'array_key_exists'
			&& count($node->args) >= 2
			&& !$context->null();
	}

public function specifyTypes(
		FunctionReflection $functionReflection,
		FuncCall $node,
		Scope $scope,
		TypeSpecifierContext $context
	): SpecifiedTypes
	{
		$keyType = $scope->getType($node->args[0]->value);

if ($context->truthy()) {
			$type = TypeCombinator::intersect(
				new ArrayType(new MixedType(), new MixedType()),
				new HasOffsetType($keyType)
			);
		} else {
			$type = new HasOffsetType($keyType);
		}

return $this->typeSpecifier->create(
			$node->args[1]->value,
			$type,
			$context
		);
	}

}