Add Arr::nth() and Arr::duplicates()

formwork/src/Utils/Arr.php

@@ -96,6 +96,15 @@ class Arr
         }
     }
 
+    /**
+     * Get the array value at the given index,
+     * negative indices are not allowed, use `Arr:at()` instead
+     */
+    public static function nth(array $array, int $index)
+    {
+        return array_values($array)[$index];
+    }
+
     /**
      * Get the array value at the given index,
      * negative indices are allowed and start from the end
@@ -123,6 +132,14 @@ class Arr
         return $key !== false ? $key : null;
     }
 
+    /**
+     * Return the duplicate elements of the array
+     */
+    public static function duplicates(array $array): array
+    {
+        return array_diff_key($array, array_unique($array));
+    }
+
     /**
      * Recursively append elements from the second array that are missing in the first
      */