Fix null-removal on nested captured-arrays (#37)

* Fix null-removeal on nested captured-arrays

* Update phpstan-baseline.neon

* Update phpstan-baseline.neon

Author: staabm

phpstan-baseline.neon

@@ -55,11 +55,6 @@ parameters:
 			count: 2
 			path: tests/PregTests/ReplaceCallbackArrayTest.php
 
-		-
-			message: "#^Parameter \\#1 \\$str(ing)? of function strtoupper expects string, string\\|null given\\.$#"
-			count: 2
-			path: tests/PregTests/ReplaceCallbackTest.php
-
 		-
 			message: "#^Regex pattern is invalid\\: No ending matching delimiter '\\}' found$#"
 			count: 2

src/PHPStan/PregReplaceCallbackClosureTypeExtension.php

@@ -61,6 +61,18 @@ public function getTypeFromStaticMethodCall(MethodReflection $methodReflection,
             $matchesType = new ConstantArrayType(
                 $matchesType->getKeyTypes(),
                 array_map(static function (Type $valueType): Type {
+                    if (count($valueType->getConstantArrays()) === 1) {
+                        $valueTypeArray = $valueType->getConstantArrays()[0];
+                        return new ConstantArrayType(
+                            $valueTypeArray->getKeyTypes(),
+                            array_map(static function (Type $valueType): Type {
+                                return TypeCombinator::removeNull($valueType);
+                            }, $valueTypeArray->getValueTypes()),
+                            $valueTypeArray->getNextAutoIndexes(),
+                            [],
+                            $valueTypeArray->isList()
+                        );
+                    }
                     return TypeCombinator::removeNull($valueType);
                 }, $matchesType->getValueTypes()),
                 $matchesType->getNextAutoIndexes(),

tests/PHPStanTests/nsrt/preg-replace-callback.php

@@ -96,8 +96,7 @@ function (string $s): void {
     Preg::replaceCallbackStrictGroups(
         '/(foo)?(bar)?(baz)?/',
         function ($matches) {
-            // should be array{array{string, int<-1, max>}, array{'foo', int<-1, max>}, array{'bar', int<-1, max>}, array{'baz', int<-1, max>}}
-            assertType("array{array{string|null, int<-1, max>}, array{'foo'|null, int<-1, max>}, array{'bar'|null, int<-1, max>}, array{'baz'|null, int<-1, max>}}", $matches);
+            assertType("array{array{string, int<-1, max>}, array{'foo', int<-1, max>}, array{'bar', int<-1, max>}, array{'baz', int<-1, max>}}", $matches);
             return '';
         },
         $s,