diff --git a/src/Psalm/Internal/Stubs/CoreGenericFunctions.php b/src/Psalm/Internal/Stubs/CoreGenericFunctions.php
index 81072aa79..ff93935a5 100644
--- a/src/Psalm/Internal/Stubs/CoreGenericFunctions.php
+++ b/src/Psalm/Internal/Stubs/CoreGenericFunctions.php
@@ -45,13 +45,12 @@ function array_unique(array $arr, int $sort_flags = 0)
  *
  * @param array<TKey, TValue> $arr
  * @param array $arr2
- * @param array|null $arr3
- * @param array|null $arr4
+ * @param array ...$arr3
  *
  * @return array<TKey, TValue>
  * @psalm-pure
  */
-function array_intersect(array $arr, array $arr2, array $arr3 = null, array $arr4 = null)
+function array_intersect(array $arr, array $arr2, array ...$arr3)
 {
 }
 
@@ -61,13 +60,12 @@ function array_intersect(array $arr, array $arr2, array $arr3 = null, array $arr
  *
  * @param array<TKey, TValue> $arr
  * @param array $arr2
- * @param array|null $arr3
- * @param array|null $arr4
+ * @param array ...$arr3
  *
  * @return array<TKey, TValue>
  * @psalm-pure
  */
-function array_intersect_key(array $arr, array $arr2, array $arr3 = null, array $arr4 = null)
+function array_intersect_key(array $arr, array $arr2, array ...$arr3)
 {
 }
 
@@ -92,13 +90,12 @@ function array_combine(array $arr, array $arr2)
  *
  * @param array<TKey, TValue> $arr
  * @param array $arr2
- * @param array|null $arr3
- * @param array|null $arr4
+ * @param array ...$arr3
  *
  * @return array<TKey, TValue>
  * @psalm-pure
  */
-function array_diff(array $arr, array $arr2, array $arr3 = null, array $arr4 = null)
+function array_diff(array $arr, array $arr2, array ...$arr3)
 {
 }
 
@@ -108,13 +105,12 @@ function array_diff(array $arr, array $arr2, array $arr3 = null, array $arr4 = n
  *
  * @param array<TKey, TValue> $arr
  * @param array $arr2
- * @param array|null $arr3
- * @param array|null $arr4
+ * @param array ...$arr3
  *
  * @return array<TKey, TValue>
  * @psalm-pure
  */
-function array_diff_key(array $arr, array $arr2, array $arr3 = null, array $arr4 = null)
+function array_diff_key(array $arr, array $arr2, array ...$arr3)
 {
 }
 
diff --git a/tests/FunctionCallTest.php b/tests/FunctionCallTest.php
index 4a18f731f..3543dfcdb 100644
--- a/tests/FunctionCallTest.php
+++ b/tests/FunctionCallTest.php
@@ -266,6 +266,16 @@ class FunctionCallTest extends TestCase
                     '$d' => 'array<string, int>',
                 ],
             ],
+            'arrayDiffIsVariadic' => [
+                '<?php
+                    array_diff([], [], [], [], []);',
+                'assertions' => [],
+            ],
+            'arrayDiffKeyIsVariadic' => [
+                '<?php
+                    array_diff_key([], [], [], [], []);',
+                'assertions' => [],
+            ],
             'arrayPopMixed' => [
                 '<?php
                     /** @var mixed */
@@ -1032,6 +1042,16 @@ class FunctionCallTest extends TestCase
                     '$bar' => 'array<int, int>',
                 ],
             ],
+            'arrayIntersectIsVariadic' => [
+                '<?php
+                    array_intersect([], [], [], [], []);',
+                'assertions' => [],
+            ],
+            'arrayIntersectKeyIsVariadic' => [
+                '<?php
+                    array_intersect_key([], [], [], [], []);',
+                'assertions' => [],
+            ],
             'arrayReduce' => [
                 '<?php
                     $arr = [2, 3, 4, 5];