Added regression test

Author: staabm

tests/PHPStan/Rules/Arrays/NonexistentOffsetInArrayDimFetchRuleTest.php

@@ -990,6 +990,13 @@ public function testBug4532(): void
 		]);
 	}
 
+	public function testBug12115(): void
+	{
+		$this->reportPossiblyNonexistentGeneralArrayOffset = true;
+
+		$this->analyse([__DIR__ . '/data/bug-12115.php'], []);
+	}
+
 	public function testBug10492(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-10492.php'], [

tests/PHPStan/Rules/Arrays/data/bug-12115.php

@@ -0,0 +1,27 @@
+<?php declare(strict_types=1);
+
+namespace Bug12115;
+
+class HelloWorld
+{
+	public function testMe(): void
+	{
+		$indexes = [1, 2, 3, 4, 5];
+		$loopArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+		$counterArray = [];
+
+
+		foreach ($indexes as $index) {
+			// Check if the index is not set in the counter array
+			if (!isset($counterArray[$index])) {
+				$counterArray[$index] = ['string_index_1' => 0, 'string_index_2' => 0];
+			}
+
+			foreach ($loopArray as $loop) {
+				$stringIndex = $loop % 2 === 0 ? 'string_index_1' : 'string_index_2';
+				$counterArray[$index][$stringIndex]++;
+			}
+		}
+
+	}
+}