Add test

tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php

@@ -618,6 +618,28 @@ public function testArrayWalkArrowFunctionCallback(): void
 		]);
 	}
 
+	public function testArrayUdiffCallback(): void
+	{
+		$this->analyse([__DIR__ . '/data/array_udiff.php'], [
+			[
+				'Parameter #3 $data_comp_func of function array_udiff expects callable(mixed, mixed): int, Closure(string, string): string given.',
+				6,
+			],
+			[
+				'Parameter #3 $data_comp_func of function array_udiff expects callable(mixed, mixed): int, Closure(int, int): non-empty-string given.',
+				14,
+			],
+			[
+				'Parameter #1 $array of function array_reduce expects array<TIn>, null given.',
+				20,
+			],
+			[
+				'Parameter #2 $callback of function array_reduce expects callable(Closure(string, int): string, TIn): Closure(string, int): string, null given.',
+				21,
+			],
+		]);
+	}
+
 	public function testPregReplaceCallback(): void
 	{
 		$this->analyse([__DIR__ . '/data/preg_replace_callback.php'], [

tests/PHPStan/Rules/Functions/data/array_udiff.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+
+array_udiff(
+	[1,2,3],
+	[4,5,6],
+	function(string $a, string $b): string {
+		return $a . $b;
+	},
+);
+
+array_udiff(
+	[1,2,3],
+	[4,5,6],
+	function(int $a, int $b): string {
+		return $a . $b;
+	},
+);
+
+array_reduce(
+	null,
+	null,
+	function(string $a, int $b): string {
+		return $a . $b;
+	},
+);
+
+array_udiff(
+	[25,26],
+	[26,27],
+	static function(int $a, int $b): int {
+		return $a <=> $b;
+	},
+);
+