Add tests for userland comparators with uasort/usort

When a builtin function like uasort calls a userland callback,
it's always treated as strict_types=0, so Stringable objects
are accepted for string parameters. Added test cases for both
strict and non-strict mode to verify no false positives.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -2761,7 +2761,7 @@ public function testBug11619Strict(): void
 			],
 			[
 				'Parameter #2 $f of function Bug11619Strict\customUsort expects callable(Stringable, Stringable): int, \'strnatcasecmp\' given.',
-				54,
+				58,
 			],
 		]);
 	}

tests/PHPStan/Rules/Functions/data/bug-11619-strict.php

@@ -43,6 +43,10 @@ function customUsort(array &$a, callable $f): void
 			[$a[$j-1], $a[$j]] = [$a[$j], $a[$j-1]];
 }
 
+function userlandComparator(string $a, string $b): int {
+	return strnatcasecmp($a, $b);
+}
+
 function test2(): void
 {
 	$options = [
@@ -52,4 +56,7 @@ function test2(): void
 	];
 
 	customUsort($options, 'strnatcasecmp');
+
+	uasort($options, 'Bug11619Strict\userlandComparator');
+	usort($options, 'Bug11619Strict\userlandComparator');
 }

tests/PHPStan/Rules/Functions/data/bug-11619.php

@@ -43,6 +43,10 @@ function customUsort(array &$a, callable $f): void
 			[$a[$j-1], $a[$j]] = [$a[$j], $a[$j-1]];
 }
 
+function userlandComparator(string $a, string $b): int {
+	return strnatcasecmp($a, $b);
+}
+
 function test2(): void
 {
 	$options = [
@@ -52,4 +56,7 @@ function test2(): void
 	];
 
 	customUsort($options, 'strnatcasecmp');
+
+	uasort($options, 'Bug11619\userlandComparator');
+	usort($options, 'Bug11619\userlandComparator');
 }