Убрано дублирование классов. Helpers уехали из Core. Классы во внешних директориях переехали к остальным.

_incl_data/class/Helper/ArraySorter.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Helper;
+class ArraySorter
+{
+    /**
+     * Groups an array by a given key.
+     *
+     * Groups an array into arrays by a given key, or set of keys, shared between all array members.
+     *
+     * Based on {@author Jake Zatecky}'s {@link https://github.com/jakezatecky/array_group_by array_group_by()} function.
+     * This variant allows $key to be closures.
+     *
+     * @param array $array   The array to have grouping performed on.
+     * @param mixed $key,... The key to group or split by. Can be a _string_,
+     *                       an _integer_, a _float_, or a _callable_.
+     *
+     *                       If the key is a callback, it must return
+     *                       a valid key from the array.
+     *
+     *                       If the key is _NULL_, the iterated element is skipped.
+     *
+     *                       ```
+     *                       string|int callback ( mixed $item )
+     *                       ```
+     *
+     * @return array|null Returns a multidimensional array or `null` if `$key` is invalid.
+     */
+    public static function groupBy(array $array, $key): ?array
+    {
+        if (!is_string($key) && !is_int($key) && !is_float($key) && !is_callable($key)) {
+            return null;
+        }
+
+        $func = (!is_string($key) && is_callable($key) ? $key : null);
+        $key2 = $key;
+
+        // Load the new array, splitting by the target key
+        $grouped = [];
+        foreach ($array as $value) {
+            $key = null;
+
+            if (is_callable($func)) {
+                $key = call_user_func($func, $value);
+            } elseif (is_object($value) && property_exists($value, $key2)) {
+                $key = $value->{$key2};
+            } elseif (isset($value[$key2])) {
+                $key = $value[$key2];
+            }
+
+            if ($key === null) {
+                continue;
+            }
+
+            $grouped[$key][] = $value;
+        }
+
+        // Recursively build a nested grouping if more parameters are supplied
+        // Each grouped array value is grouped according to the next sequential key
+        if (func_num_args() > 2) {
+            $args = func_get_args();
+
+            foreach ($grouped as $key => $value) {
+                $params = array_merge([$value], array_slice($args, 2, func_num_args()));
+                $grouped[$key] = call_user_func_array('array_group_by', $params);
+            }
+        }
+
+        return $grouped;
+    }
+}