Identifier cannot contain spaces

Author: ondrejmirtes

src/Type/Constant/ConstantArrayType.php

@@ -1586,7 +1586,7 @@ public function toPhpDocNode(): TypeNode
 
 	public static function isValidIdentifier(string $value): bool
 	{
-		$result = Strings::match($value, '~(?:[\\\\]?+[a-z_\\x80-\\xFF][0-9a-z_\\x80-\\xFF-]*+)++~Asi');
+		$result = Strings::match($value, '~^(?:[\\\\]?+[a-z_\\x80-\\xFF][0-9a-z_\\x80-\\xFF-]*+)++$~si');
 
 		return $result !== null;
 	}

tests/PHPStan/Type/TypeToPhpDocNodeTest.php

@@ -73,6 +73,15 @@ public function dataToPhpDocNode(): iterable
 			"array{'1100-RB': 1}",
 		];
 
+		yield [
+			new ConstantArrayType([
+				new ConstantStringType('Karlovy Vary'),
+			], [
+				new ConstantIntegerType(1),
+			], [0]),
+			"array{'Karlovy Vary': 1}",
+		];
+
 		yield [
 			new ObjectShapeType([
 				'1100-RB' => new ConstantIntegerType(1),