Make functions present in functionMap but not in PhpStorm stubs known

Author: ondrejmirtes

src/Reflection/Runtime/RuntimeReflectionProvider.php

@@ -302,7 +302,7 @@ private function getCustomFunction(\PhpParser\Node\Name $nameNode, ?Scope $scope
 	public function resolveFunctionName(\PhpParser\Node\Name $nameNode, ?Scope $scope): ?string
 	{
 		return $this->resolveName($nameNode, function (string $name): bool {
-			$exists = function_exists($name);
+			$exists = function_exists($name) || $this->nativeFunctionReflectionProvider->findFunctionReflection($name) !== null;
 			if ($exists) {
 				if ($this->phpStormStubsSourceStubber->isPresentFunction($name) === false) {
 					return false;

tests/PHPStan/Analyser/AnalyserIntegrationTest.php

@@ -374,6 +374,12 @@ public function testBug4288(): void
 		$this->assertSame(10, $nativeProperty->getDefaultValue());
 	}
 
+	public function testBug4702(): void
+	{
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-4702.php');
+		$this->assertCount(0, $errors);
+	}
+
 	/**
 	 * @param string $file
 	 * @return \PHPStan\Analyser\Error[]

tests/PHPStan/Analyser/data/bug-4702.php

@@ -0,0 +1,6 @@
+<?php
+
+$archive = 'test.rar';
+$password = '1323';
+
+$archive = rar_open($archive, $password);