diff --git a/resources/functionMap.php b/resources/functionMap.php
index 8e291259e0a..6a689fb7c5c 100644
--- a/resources/functionMap.php
+++ b/resources/functionMap.php
@@ -8635,12 +8635,12 @@
 'Redis::sDiff' => ['__benevolent<Redis|list<string>|false>', 'key'=>'string', '...other_keys='=>'string'],
 'Redis::sDiffStore' => ['__benevolent<Redis|int|false>', 'dst'=>'string', 'key'=>'string', '...other_keys='=>'string'],
 'Redis::select' => ['__benevolent<Redis|bool>', 'db'=>'int'],
-'Redis::set' => ['__benevolent<Redis|string|bool>', 'key'=>'string', 'value'=>'mixed', 'options='=>'array'],
+'Redis::set' => ['__benevolent<Redis|string|bool>', 'key'=>'string', 'value'=>'mixed', 'options='=>'array|int|null'],
 'Redis::setBit' => ['__benevolent<Redis|int|bool>', 'key'=>'string', 'idx'=>'int', 'value'=>'bool'],
 'Redis::setex' => ['__benevolent<Redis|bool>', 'key'=>'string', 'expire'=>'int', 'value'=>'mixed'],
 'Redis::setnx' => ['__benevolent<Redis|bool>', 'key'=>'string', 'value'=>'mixed'],
 'Redis::setRange' => ['__benevolent<Redis|int|false>', 'key'=>'string', 'index'=>'int', 'value'=>'string'],
-'Redis::sInter' => ['__benevolent<Redis|list<string>|false>', 'key'=>'string', '...other_keys='=>'string'],
+'Redis::sInter' => ['__benevolent<Redis|list<string>|false>', 'key'=>'string|string[]', '...other_keys='=>'string'],
 'Redis::sintercard' => ['__benevolent<Redis|int|false>', 'keys'=>'string[]', 'limit='=>'int'],
 'Redis::sInterStore' => ['__benevolent<Redis|int|false>', 'key'=>'string[]|string', '...other_keys='=>'string'],
 'Redis::sismember' => ['__benevolent<Redis|bool>', 'key'=>'string', 'value'=>'mixed'],
@@ -8680,7 +8680,7 @@
 'Redis::xtrim' => ['__benevolent<Redis|array|false>', 'key'=>'string', 'threshold'=>'string', 'approx='=>'bool', 'minid='=>'bool', 'limit='=>'int'],
 'Redis::zAdd' => ['__benevolent<Redis|int|float|false>', 'key'=>'string', 'score_or_options'=>'array|float', '...more_scores_and_mems='=>'mixed'],
 'Redis::zCard' => ['__benevolent<Redis|int|false>', 'key'=>'string'],
-'Redis::zCount' => ['__benevolent<Redis|int|false>', 'key'=>'string', 'start'=>'string', 'end'=>'string'],
+'Redis::zCount' => ['__benevolent<Redis|int|false>', 'key'=>'string', 'start'=>'string|int', 'end'=>'string|int'],
 'Redis::zIncrBy' => ['__benevolent<Redis|float|false>', 'key'=>'string', 'value'=>'float', 'member'=>'mixed'],
 'Redis::zInter' => ['__benevolent<Redis|array|false>', 'keys'=>'string[]', 'weights='=>'?array', 'options='=>'?array'],
 'Redis::zmpop' => ['__benevolent<Redis|array|null|false>', 'keys'=>'string[]', 'from'=>'string', 'count='=>'int'],
@@ -8719,7 +8719,7 @@
 'RedisCluster::multi' => ['__benevolent<RedisCluster|bool>', 'mode='=>'int'],
 'RedisCluster::punSubscribe' => ['__benevolent<array|bool>', 'pattern'=>'string', '...other_patterns='=>'string'],
 'RedisCluster::sDiff' => ['list<string>', 'key'=>'string', '...other_keys='=>'string'],
-'RedisCluster::sInter' => ['list<string>', 'key'=>'string', '...other_keys='=>'string'],
+'RedisCluster::sInter' => ['list<string>', 'key'=>'string|string[]', '...other_keys='=>'string'],
 'RedisCluster::sMembers' => ['list<string>', 'key'=>'string'],
 'RedisCluster::unSubscribe' => ['__benevolent<array|bool>', 'channels'=>'array'],
 'ReflectionClass::export' => ['string|null', 'argument'=>'string|object', 'return='=>'bool'],
diff --git a/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php b/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
index 3151e173287..62761326049 100644
--- a/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
@@ -4581,6 +4581,19 @@ public function testBug15251(): void
 		$this->analyse([__DIR__ . '/data/bug-15251.php'], []);
 	}
 
+	public function testBug15393(): void
+	{
+		$this->checkThisOnly = false;
+		$this->checkNullables = true;
+		$this->checkUnionTypes = true;
+		$this->analyse([__DIR__ . '/data/bug-15393.php'], [
+			[
+				'Parameter #3 $options of method Redis::set() expects array|int|null, string given.',
+				11,
+			],
+		]);
+	}
+
 	#[RequiresPhp('>= 8.0.0')]
 	public function testBug12820(): void
 	{
diff --git a/tests/PHPStan/Rules/Methods/data/bug-15393.php b/tests/PHPStan/Rules/Methods/data/bug-15393.php
new file mode 100644
index 00000000000..d6def950745
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-15393.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+
+namespace Bug15393;
+
+function doFoo(\Redis $redis): void
+{
+	$redis->set('key', 'value', 60);
+	$redis->set('key', 'value', ['nx', 'ex' => 60]);
+	$redis->set('key', 'value', null);
+	$redis->set('key', 'value');
+	$redis->set('key', 'value', 'foo');
+}
+
+function doBar(\Redis $redis, \RedisCluster $cluster): void
+{
+	$redis->sInter(['key1', 'key2']);
+	$cluster->sInter(['key1', 'key2']);
+	$redis->zCount('key', 0, 100);
+	$redis->zCount('key', '-inf', '+inf');
+}