add test for bug 10396

Author: schlndh

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -1780,6 +1780,15 @@ public function testParameterClosureTypeExtension(): void
 		]);
 	}
 
+	public function testBug10396(): void
+	{
+		if (PHP_VERSION_ID < 70400) {
+			$this->markTestSkipped('Test requires PHP 7.4');
+		}
+
+		$this->analyse([__DIR__ . '/data/bug-10396.php'], []);
+	}
+
 	public function testBug11559(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-11559.php'], []);

tests/PHPStan/Rules/Functions/data/bug-10396.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types = 1); // lint >= 8.1
+
+namespace Bug10396;
+
+function test(): string|null {
+	$flags = \PREG_OFFSET_CAPTURE | \PREG_UNMATCHED_AS_NULL;
+	return preg_replace_callback('/bar/', callback(...), 'foobar', -1, $count, $flags);
+}
+
+/**
+ * @param array<int|string, array{0: string|null, 1: int}> $match
+ * @return string
+ */
+function callback(array $match): string {
+	return (string) $match[0][1];
+}