diff --git a/stubs/core.stub b/stubs/core.stub
index f608f51110..37168e972d 100644
--- a/stubs/core.stub
+++ b/stubs/core.stub
@@ -377,3 +377,12 @@ function register_tick_function(callable $callback, mixed ...$args): bool {}
  * @return resource|false
  */
 function proc_open($command, array $descriptor_spec, &$pipes, ?string $cwd = null, ?array $env_vars = null, ?array $options = null) {}
+
+/**
+ * @param mixed &$hosts
+ * @param mixed &$weights
+ *
+ * @param-out list<string> $hosts
+ * @param-out list<int>    $weights
+ */
+function getmxrr(string $hostname, &$hosts, &$weights = null): bool {}
diff --git a/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php b/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
index 45692c1ea7..2494158ca7 100644
--- a/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
+++ b/tests/PHPStan/Rules/Functions/CallToFunctionParametersRuleTest.php
@@ -2663,6 +2663,13 @@ public function testBug10612(): void
 		$this->analyse([__DIR__ . '/data/bug-10612.php'], []);
 	}
 
+	public function testBug10704(): void
+	{
+		$this->checkExplicitMixed = true;
+		$this->checkImplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-10704.php'], []);
+	}
+
 	#[RequiresPhp('>= 8.1')]
 	public function testBug9652(): void
 	{
diff --git a/tests/PHPStan/Rules/Functions/data/bug-10704.php b/tests/PHPStan/Rules/Functions/data/bug-10704.php
new file mode 100644
index 0000000000..a830e36da7
--- /dev/null
+++ b/tests/PHPStan/Rules/Functions/data/bug-10704.php
@@ -0,0 +1,8 @@
+<?php declare(strict_types = 1);
+
+namespace Bug10704;
+
+$hosts   = [];
+$weights = [];
+$success = getmxrr('', $hosts, $weights);
+echo count($hosts);