Add test

Author: VincentLanglet

tests/PHPStan/Rules/Functions/ParameterCastableToNumberRuleTest.php

@@ -249,6 +249,14 @@ public function testBug13775TerWithoutUnion(): void
 				'Parameter #1 $array of function array_product expects an array of values castable to number, array<int, mixed> given.',
 				6,
 			],
+			[
+				'Parameter #1 $array of function array_sum expects an array of values castable to number, array<string> given.',
+				14,
+			],
+			[
+				'Parameter #1 $array of function array_product expects an array of values castable to number, array<string> given.',
+				15,
+			],
 		]));
 	}
 

tests/PHPStan/Rules/Functions/data/bug-13775-ter.php

@@ -8,3 +8,8 @@
 $b = rand(0, 1) ? 42 : '';
 echo array_sum([$b]) . "\n\n";
 echo array_product([$b]) . "\n\n";
+
+/** @var iterable<int>|array<string> $c */
+$c = doFoo();
+echo array_sum($c) . "\n\n";
+echo array_product($c) . "\n\n";