Revert "[8.x] Add reduce with keys to collections and lazy collections (

#35839)"

This reverts commit 08dbb8b.

src/Illuminate/Collections/Collection.php

@@ -884,24 +884,6 @@ public function reduce(callable $callback, $initial = null)
         return array_reduce($this->items, $callback, $initial);
     }
 
-    /**
-     * Reduce an associative collection to a single value.
-     *
-     * @param  callable  $callback
-     * @param  mixed $initial
-     * @return mixed
-     */
-    public function reduceWithKeys(callable $callback, $initial = null)
-    {
-        $result = $initial;
-
-        foreach ($this->items as $key => $value) {
-            $result = $callback($result, $value, $key);
-        }
-
-        return $result;
-    }
-
     /**
      * Replace the collection items with the given items.
      *

src/Illuminate/Collections/LazyCollection.php

@@ -845,24 +845,6 @@ public function reduce(callable $callback, $initial = null)
         return $result;
     }
 
-    /**
-     * Reduce an associative collection to a single value.
-     *
-     * @param  callable  $callback
-     * @param  mixed $initial
-     * @return mixed
-     */
-    public function reduceWithKeys(callable $callback, $initial = null)
-    {
-        $result = $initial;
-
-        foreach ($this as $key => $value) {
-            $result = $callback($result, $value, $key);
-        }
-
-        return $result;
-    }
-
     /**
      * Replace the collection items with the given items.
      *

tests/Support/SupportCollectionTest.php

@@ -3592,20 +3592,6 @@ public function testReduce($collection)
         }));
     }
 
-    /**
-     * @dataProvider collectionClassProvider
-     */
-    public function testReduceWithKeys($collection)
-    {
-        $data = new $collection([
-            'foo' => 'bar',
-            'baz' => 'qux',
-        ]);
-        $this->assertEquals('foobarbazqux', $data->reduceWithKeys(function ($carry, $element, $key) {
-            return $carry .= $key.$element;
-        }));
-    }
-
     /**
      * @dataProvider collectionClassProvider
      */