Fix native return type of array_chunk

Author: ondrejmirtes

resources/functionMap.php

@@ -259,7 +259,7 @@
 'AppendIterator::rewind' => ['void'],
 'AppendIterator::valid' => ['bool'],
 'array_change_key_case' => ['array', 'input'=>'array', 'case='=>'int'],
-'array_chunk' => ['list<array[]>', 'input'=>'array', 'size'=>'positive-int', 'preserve_keys='=>'bool'],
+'array_chunk' => ['list<array>', 'input'=>'array', 'size'=>'positive-int', 'preserve_keys='=>'bool'],
 'array_column' => ['array', 'array'=>'array', 'column_key'=>'mixed', 'index_key='=>'mixed'],
 'array_combine' => ['array|false', 'keys'=>'array', 'values'=>'array'],
 'array_count_values' => ['array<positive-int>', 'input'=>'array'],

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -1202,6 +1202,7 @@ public function dataFileAsserts(): iterable
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7607.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/ibm_db2.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/benevolent-union-math.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-8956.php');
 	}
 
 	/**

tests/PHPStan/Analyser/data/bug-8956.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Bug8956;
+
+use function PHPStan\Testing\assertNativeType;
+use function PHPStan\Testing\assertType;
+
+class Foo
+{
+
+	public function doFoo(): void
+	{
+		foreach (array_chunk(range(0, 10), 60) as $chunk) {
+			assertType('array{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}', $chunk);
+			assertNativeType('array', $chunk);
+			foreach ($chunk as $val) {
+				assertType('0|1|2|3|4|5|6|7|8|9|10', $val);
+				assertNativeType('mixed', $val);
+			}
+		}
+	}
+
+	public function doBar(): void
+	{
+		assertType('array{array{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}', array_chunk(range(0, 10), 60));
+		assertNativeType('list<array>', array_chunk(range(0, 10), 60));
+	}
+
+}