Fix bug in splitting int arrays, add function for splitting string

arrays

src/MD_STD.php

@@ -773,7 +773,7 @@ final class MD_STD {
      * @param array<int, int> $input Input array.
      * @param positive-int    $size  Size of each part of the return set.
      *
-     * @return array<non-empty-array<integer>>
+     * @return array<non-empty-array<int, integer>>
      */
     public static function split_int_array_into_sized_parts(array $input, int $size):array {
 
@@ -788,7 +788,36 @@ final class MD_STD {
         while ($offset < $max) {
             $cur = array_slice($input, $offset, $size - 1);
             if (!empty($cur)) $output[] = $cur;
-            $offset += $size;
+            $offset += $size - 1;
+        }
+
+        return $output;
+
+    }
+
+    /**
+     * Splits an lists of strings into parts of a predefined size and returns those
+     * as sub-lists of a superordinate list.
+     *
+     * @param array<int, string> $input Input array.
+     * @param positive-int       $size  Size of each part of the return set.
+     *
+     * @return array<non-empty-array<int, string>>
+     */
+    public static function split_string_array_into_sized_parts(array $input, int $size):array {
+
+        /*
+        if ($size < 1) throw new Exception("Size of the target array must be a positive integer");
+         */
+
+        $output = [];
+
+        $max = count($input);
+        $offset = 0;
+        while ($offset < $max) {
+            $cur = array_slice($input, $offset, $size - 1);
+            if (!empty($cur)) $output[] = $cur;
+            $offset += $size - 1;
         }
 
         return $output;