More WIP on Arr functions

src/Arr.php

@@ -103,6 +103,62 @@ class Arr
         return array_count_values(...);
     }
 
+    /**
+     * Compares `$array` against one or more other arrays and returns the values in `$array` that are not present in any
+     * of the other arrays.
+     *
+     * @param array ...$arrays The arrays against which the comparison should be made
+     * @return callable<array, array> A function that calls `array_diff` with the given array.
+     * @see https://www.php.net/manual/en/function.array-diff.php array_diff Documentation
+     */
+    public static function diff(array ...$arrays): callable
+    {
+        return fn (array $array) => array_diff($array, ...$arrays);
+    }
+
+    /**
+     * Compares `$array` against `$arrays` and returns the difference. Unlike `Arr::diff()`, the array keys are also
+     * used in the comparison.
+     *
+     * @param array ...$arrays The arrays against which the comparison should be made
+     * @return callable<array, array> A function that calls `array_diff_assoc` with the given array.
+     * @see https://www.php.net/manual/en/function.array-diff-assoc.php array_diff_assoc Documentation
+     */
+    public static function diffAssoc(array ...$arrays): callable
+    {
+        return fn (array $array) => array_diff_assoc($array, ...$arrays);
+    }
+
+    /**
+     * Compares the keys from `$array` against the keys from `$arrays` and returns the difference. This function is like
+     * `Arr::diff()`, except the comparison is done on the keys instead of the values.
+     *
+     * @param array ...$arrays The arrays against which the comparison should be made
+     * @return callable<array, array> A function that calls `array_diff_key` with the given array.
+     * @see https://www.php.net/manual/en/function.array-diff-key.php array_diff_key Documentation
+     */
+    public static function diffKey(array ...$arrays): callable
+    {
+        return fn (array $array) => array_diff_key($array, ...$arrays);
+    }
+
+    /**
+     * Compares `$array` against `$arrays` and returns the difference. Unlike `Arr::diff()`, the array keys are also
+     * used in the comparison. Unlike `Arr::diffAssoc()`, a user supplied callback function is used for the indices
+     * comparison, not internal function.
+     *
+     * @param callable<mixed, mixed, int> $keyCompareFunc The comparison function must return an integer less than,
+     *     equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or
+     *     greater than the second.
+     * @param array ...$arrays The arrays against which the comparison should be made
+     * @return callable<array, array> A function that calls `array_diff_assoc` with the given array.
+     * @see https://www.php.net/manual/en/function.array-diff-assoc.php array_diff_assoc Documentation
+     */
+    public static function diffUAssoc(callable $keyCompareFunc, array ...$arrays): callable
+    {
+        return fn (array $array) => array_diff_uassoc($array, $arrays, $keyCompareFunc);
+    }
+
     /**
      * Transform each element of an array to a different element (optionally merging other mapped arrays).
      *