From 2470527571aeeb02e7860e5bc6bc9d46b9408bf7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 19:54:39 +0200
Subject: [PATCH 01/10] Add `concurrent` to `Arr`

---
 src/Illuminate/Collections/Arr.php | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index 6c661f98bef3..5f9fc13b8200 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -4,12 +4,14 @@
 
 use ArgumentCountError;
 use ArrayAccess;
+use ArrayIterator;
 use Closure;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Contracts\Support\Jsonable;
 use Illuminate\Support\Traits\Macroable;
 use InvalidArgumentException;
 use JsonSerializable;
+use MultipleIterator;
 use Random\Randomizer;
 use SortDirection;
 use Traversable;
@@ -1308,6 +1310,17 @@ public static function whereNotNull($array)
         return static::where($array, fn ($value) => ! is_null($value));
     }
 
+    public static function concurrent(array ...$arguments)
+    {
+        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ALL|MultipleIterator::MIT_KEYS_ASSOC);
+        
+        foreach ($arguments as $idx => $array) {
+            $multipleIterator->attachIterator(new ArrayIterator($array), $idx);
+        }
+        
+        return $multipleIterator;
+    }
+
     /**
      * If the given value is not an array and not null, wrap it in one.
      *

From 89644df8dc67df0c4ebae78a90f47531ef15a4de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 19:57:54 +0200
Subject: [PATCH 02/10] Set type flag dependent on array type

---
 src/Illuminate/Collections/Arr.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index 5f9fc13b8200..d04d84c13a92 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -1312,7 +1312,10 @@ public static function whereNotNull($array)
 
     public static function concurrent(array ...$arguments)
     {
-        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ALL|MultipleIterator::MIT_KEYS_ASSOC);
+        $typeFlag = array_all($arguments, fn ($value) => array_is_list($value))
+            ? MultipleIterator::MIT_KEYS_ASSOC
+            : MultipleIterator::MIT_KEYS_NUMERIC;
+        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ALL|$typeFlag);
         
         foreach ($arguments as $idx => $array) {
             $multipleIterator->attachIterator(new ArrayIterator($array), $idx);

From 2ad099c4d5952ec08fdf7e49cda58b32a8f957a0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:01:02 +0200
Subject: [PATCH 03/10] Use `*_ANY` instead of `*_ALL` as sensitive default

---
 src/Illuminate/Collections/Arr.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index d04d84c13a92..8667e2575aac 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -1315,7 +1315,7 @@ public static function concurrent(array ...$arguments)
         $typeFlag = array_all($arguments, fn ($value) => array_is_list($value))
             ? MultipleIterator::MIT_KEYS_ASSOC
             : MultipleIterator::MIT_KEYS_NUMERIC;
-        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ALL|$typeFlag);
+        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ANY|$typeFlag);
         
         foreach ($arguments as $idx => $array) {
             $multipleIterator->attachIterator(new ArrayIterator($array), $idx);

From c8eca9f4c045f038d681b3f859b3997ccea487b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:06:43 +0200
Subject: [PATCH 04/10] Add test for `Arr::concurrent()`

---
 tests/Support/SupportArrTest.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index 0653262c7ca1..cbcdbde59d71 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -11,6 +11,7 @@
 use Illuminate\Support\MultipleItemsFoundException;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\IgnoreDeprecations;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 use WeakMap;
@@ -1962,4 +1963,17 @@ public function testPartition()
 
         $this->assertEquals([[0 => 'John', 1 => 'Jane'], [2 => 'Greg']], $result);
     }
+
+    #[TestWith([[[1, 2], [3, 4]], [2, 4, 6, 8]])]
+    #[TestWith([[['a' => 1, 'b' => 2], ['c' => 3, 'd' => 4]], [2, 4, 6, 8]])]
+    public function testConcurrent(array $input, array $output)
+    {
+        $result = [];
+
+        foreach (Arr::concurrent(...$input) as $key => [$c, $d]) {
+            array_push($result, ...array_map(fn ($value) => $value * 2), [$c, $d])
+        }
+        
+        $this->assertEquals($output, $result);
+    }
 }

From 78917eb0e135282300773a533d29efc229aaa99b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:13:13 +0200
Subject: [PATCH 05/10] StyleCI

---
 src/Illuminate/Collections/Arr.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index 8667e2575aac..6228212999a4 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -1316,11 +1316,11 @@ public static function concurrent(array ...$arguments)
             ? MultipleIterator::MIT_KEYS_ASSOC
             : MultipleIterator::MIT_KEYS_NUMERIC;
         $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ANY|$typeFlag);
-        
+
         foreach ($arguments as $idx => $array) {
             $multipleIterator->attachIterator(new ArrayIterator($array), $idx);
         }
-        
+
         return $multipleIterator;
     }
 

From 71a586ed492d97b7a7d874c2bad25e403d5d5db5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:14:08 +0200
Subject: [PATCH 06/10] Add missing semicolon

---
 tests/Support/SupportArrTest.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index cbcdbde59d71..4b6754091fa3 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -1971,7 +1971,7 @@ public function testConcurrent(array $input, array $output)
         $result = [];
 
         foreach (Arr::concurrent(...$input) as $key => [$c, $d]) {
-            array_push($result, ...array_map(fn ($value) => $value * 2), [$c, $d])
+            array_push($result, ...array_map(fn ($value) => $value * 2), [$c, $d]);
         }
         
         $this->assertEquals($output, $result);

From 70113c9edbffecc299ccbd79b7d1357f0e528a5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:14:53 +0200
Subject: [PATCH 07/10] StyleCI

---
 src/Illuminate/Collections/Arr.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index 6228212999a4..fe2018138044 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -1315,7 +1315,7 @@ public static function concurrent(array ...$arguments)
         $typeFlag = array_all($arguments, fn ($value) => array_is_list($value))
             ? MultipleIterator::MIT_KEYS_ASSOC
             : MultipleIterator::MIT_KEYS_NUMERIC;
-        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ANY|$typeFlag);
+        $multipleIterator = new MultipleIterator(MultipleIterator::MIT_NEED_ANY | $typeFlag);
 
         foreach ($arguments as $idx => $array) {
             $multipleIterator->attachIterator(new ArrayIterator($array), $idx);

From 1825e9a1d25ac73c56d91c8273562ba06439b271 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:16:26 +0200
Subject: [PATCH 08/10] StyleCI

---
 tests/Support/SupportArrTest.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index 4b6754091fa3..6eef05799af7 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -1973,7 +1973,7 @@ public function testConcurrent(array $input, array $output)
         foreach (Arr::concurrent(...$input) as $key => [$c, $d]) {
             array_push($result, ...array_map(fn ($value) => $value * 2), [$c, $d]);
         }
-        
+
         $this->assertEquals($output, $result);
     }
 }

From b67bd62bc9b69eb1e2e52aa0b0108a04ef23609b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:17:14 +0200
Subject: [PATCH 09/10] Simplify test

---
 tests/Support/SupportArrTest.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index 6eef05799af7..6720ec854ed6 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -1971,7 +1971,7 @@ public function testConcurrent(array $input, array $output)
         $result = [];
 
         foreach (Arr::concurrent(...$input) as $key => [$c, $d]) {
-            array_push($result, ...array_map(fn ($value) => $value * 2), [$c, $d]);
+            array_push($result, $c * 2, $d * 2);
         }
 
         $this->assertEquals($output, $result);

From 756c81ad52aee49e9da7dfb864667cf1c0eb2945 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Fri, 24 Jul 2026 20:23:21 +0200
Subject: [PATCH 10/10] Correct order

---
 tests/Support/SupportArrTest.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index 6720ec854ed6..c53c09ae5248 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -1964,8 +1964,8 @@ public function testPartition()
         $this->assertEquals([[0 => 'John', 1 => 'Jane'], [2 => 'Greg']], $result);
     }
 
-    #[TestWith([[[1, 2], [3, 4]], [2, 4, 6, 8]])]
-    #[TestWith([[['a' => 1, 'b' => 2], ['c' => 3, 'd' => 4]], [2, 4, 6, 8]])]
+    #[TestWith([[[1, 2], [3, 4]], [2, 6, 4, 8]])]
+    #[TestWith([[['a' => 1, 'b' => 2], ['c' => 3, 'd' => 4]], [2, 6, 4, 8]])]
     public function testConcurrent(array $input, array $output)
     {
         $result = [];