diff --git a/bin/functionMetadata_original.php b/bin/functionMetadata_original.php
index a57224a0bb..d429d11b59 100644
--- a/bin/functionMetadata_original.php
+++ b/bin/functionMetadata_original.php
@@ -170,6 +170,9 @@
 	'DateTimeImmutable::getTimestamp' => ['hasSideEffects' => false],
 	'DateTimeImmutable::getTimezone' => ['hasSideEffects' => false],
 
+	'SplDoublyLinkedList::pop' => ['hasSideEffects' => true],
+	'SplDoublyLinkedList::shift' => ['hasSideEffects' => true],
+
 	'SplFileObject::fflush' => ['hasSideEffects' => true],
 	'SplFileObject::fgetc' => ['hasSideEffects' => true],
 	'SplFileObject::fgetcsv' => ['hasSideEffects' => true],
@@ -183,6 +186,24 @@
 	'SplFileObject::ftruncate' => ['hasSideEffects' => true],
 	'SplFileObject::fwrite' => ['hasSideEffects' => true],
 
+	'SplFixedArray::extract' => ['hasSideEffects' => true],
+
+	'SplHead::extract' => ['hasSideEffects' => true],
+	'SplHead::insert' => ['hasSideEffects' => true],
+	'SplHead::recoverFromCorruption' => ['hasSideEffects' => true],
+
+	'SplObjectStorage::addAll' => ['hasSideEffects' => true],
+	'SplObjectStorage::attach' => ['hasSideEffects' => true],
+	'SplObjectStorage::detach' => ['hasSideEffects' => true],
+	'SplObjectStorage::removeAll' => ['hasSideEffects' => true],
+	'SplObjectStorage::removeAllExcept' => ['hasSideEffects' => true],
+
+	'SplPriorityQueue::extract' => ['hasSideEffects' => true],
+	'SplPriorityQueue::insert' => ['hasSideEffects' => true],
+	'SplPriorityQueue::recoverFromCorruption' => ['hasSideEffects' => true],
+
+	'SplQueue::dequeue' => ['hasSideEffects' => true],
+
 	'XmlReader::next' => ['hasSideEffects' => true],
 	'XmlReader::read' => ['hasSideEffects' => true],
 ];
diff --git a/resources/functionMetadata.php b/resources/functionMetadata.php
index fd7076124f..97f858cc49 100644
--- a/resources/functionMetadata.php
+++ b/resources/functionMetadata.php
@@ -639,6 +639,8 @@
 	'SimpleXMLIterator::hasChildren' => ['hasSideEffects' => false],
 	'SimpleXMLIterator::valid' => ['hasSideEffects' => false],
 	'SoapFault::__construct' => ['hasSideEffects' => false],
+	'SplDoublyLinkedList::pop' => ['hasSideEffects' => true],
+	'SplDoublyLinkedList::shift' => ['hasSideEffects' => true],
 	'SplFileObject::fflush' => ['hasSideEffects' => true],
 	'SplFileObject::fgetc' => ['hasSideEffects' => true],
 	'SplFileObject::fgetcsv' => ['hasSideEffects' => true],
@@ -651,6 +653,19 @@
 	'SplFileObject::fseek' => ['hasSideEffects' => true],
 	'SplFileObject::ftruncate' => ['hasSideEffects' => true],
 	'SplFileObject::fwrite' => ['hasSideEffects' => true],
+	'SplFixedArray::extract' => ['hasSideEffects' => true],
+	'SplHead::extract' => ['hasSideEffects' => true],
+	'SplHead::insert' => ['hasSideEffects' => true],
+	'SplHead::recoverFromCorruption' => ['hasSideEffects' => true],
+	'SplObjectStorage::addAll' => ['hasSideEffects' => true],
+	'SplObjectStorage::attach' => ['hasSideEffects' => true],
+	'SplObjectStorage::detach' => ['hasSideEffects' => true],
+	'SplObjectStorage::removeAll' => ['hasSideEffects' => true],
+	'SplObjectStorage::removeAllExcept' => ['hasSideEffects' => true],
+	'SplPriorityQueue::extract' => ['hasSideEffects' => true],
+	'SplPriorityQueue::insert' => ['hasSideEffects' => true],
+	'SplPriorityQueue::recoverFromCorruption' => ['hasSideEffects' => true],
+	'SplQueue::dequeue' => ['hasSideEffects' => true],
 	'Spoofchecker::__construct' => ['hasSideEffects' => false],
 	'StringBackedEnum::from' => ['hasSideEffects' => false],
 	'StringBackedEnum::tryFrom' => ['hasSideEffects' => false],
diff --git a/tests/PHPStan/Rules/Comparison/NumberComparisonOperatorsConstantConditionRuleTest.php b/tests/PHPStan/Rules/Comparison/NumberComparisonOperatorsConstantConditionRuleTest.php
index e6913ff669..f05edf6b3d 100644
--- a/tests/PHPStan/Rules/Comparison/NumberComparisonOperatorsConstantConditionRuleTest.php
+++ b/tests/PHPStan/Rules/Comparison/NumberComparisonOperatorsConstantConditionRuleTest.php
@@ -245,6 +245,12 @@ public function testBug9850(): void
 		$this->analyse([__DIR__ . '/data/bug-9850.php'], []);
 	}
 
+	public function testBug9180(): void
+	{
+		$this->treatPhpDocTypesAsCertain = true;
+		$this->analyse([__DIR__ . '/data/bug-9180.php'], []);
+	}
+
 	public function testBug12716(): void
 	{
 		$this->treatPhpDocTypesAsCertain = true;
diff --git a/tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php b/tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php
index 3e75e3bc52..a0efad16b4 100644
--- a/tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php
+++ b/tests/PHPStan/Rules/Comparison/StrictComparisonOfDifferentTypesRuleTest.php
@@ -996,6 +996,11 @@ public function testBug12946(): void
 		$this->analyse([__DIR__ . '/data/bug-12946.php'], []);
 	}
 
+	public function testBug10884(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-10884.php'], []);
+	}
+
 	public function testBug13208(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-13208.php'], []);
diff --git a/tests/PHPStan/Rules/Comparison/data/bug-10884.php b/tests/PHPStan/Rules/Comparison/data/bug-10884.php
new file mode 100644
index 0000000000..36845f3f47
--- /dev/null
+++ b/tests/PHPStan/Rules/Comparison/data/bug-10884.php
@@ -0,0 +1,49 @@
+<?php declare(strict_types = 1);
+
+namespace Bug10884;
+
+class Cat {}
+
+/** @var \SplObjectStorage<Cat, null> $map */
+$map = new \SplObjectStorage();
+$map->attach(new Cat());
+$map->attach(new Cat());
+
+class Manager
+{
+	/**
+	 * @param SplObjectStorage<Cat, null> $map
+	 */
+	public function doSomething(\SplObjectStorage $map): void
+	{
+		/** @var \SplObjectStorage<Cat, null> $other */
+		$other = new \SplObjectStorage();
+
+		if (count($map) === 0) {
+			return;
+		}
+
+		foreach ($map as $cat) {
+			if (!$this->someCheck($cat)) {
+				continue;
+			}
+
+			$other->attach($cat);
+		}
+
+		$map->removeAll($other);
+
+		if (count($map) === 0) {
+			return;
+		}
+
+		// ok!
+	}
+
+	private function someCheck(Cat $cat): bool {
+		// just some random
+		return $cat == true;
+	}
+}
+
+(new Manager())->doSomething($map);
diff --git a/tests/PHPStan/Rules/Comparison/data/bug-9180.php b/tests/PHPStan/Rules/Comparison/data/bug-9180.php
new file mode 100644
index 0000000000..d92e3b213c
--- /dev/null
+++ b/tests/PHPStan/Rules/Comparison/data/bug-9180.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Bug9180;
+
+$queue = new \SplQueue();
+
+$queue->push(1);
+
+if ($queue->count() > 0) {
+	for ($i=0;$i<5;$i++) {
+		while ($queue->count() > 0 && $value = $queue->shift()) {
+			//do something with $value
+		}
+	}
+}