diff --git a/Math/Matrix/Vector.php b/Math/Matrix/Vector.php
index 90967100f..b45fca34c 100644
--- a/Math/Matrix/Vector.php
+++ b/Math/Matrix/Vector.php
@@ -3,7 +3,7 @@
 namespace phpOMS\Math\Matrix;
 
 class Vector extends Matrix {
-    public function __constrcut(int $m) 
+    public function __construct(int $m) 
     {
         parent::__construct($m);
     }   
diff --git a/System/File/Directory.php b/System/File/Directory.php
index ad6747514..673fb4631 100644
--- a/System/File/Directory.php
+++ b/System/File/Directory.php
@@ -64,7 +64,7 @@ class Directory extends FileAbstract implements \Iterator, \ArrayAccess
     public function __construct(string $path, string $filter = '*') 
     {
         $this->filter = $filter;
-        parent::__constrct($path);
+        parent::__construct($path);
 
         if(file_exists($this->path)) {
             parent::index();
diff --git a/System/File/File.php b/System/File/File.php
index a3a8c7966..f72271023 100644
--- a/System/File/File.php
+++ b/System/File/File.php
@@ -48,7 +48,7 @@ class File extends FileAbstract
 
     public function __construct(string $path) 
     {
-        parent::__constrct($path);
+        parent::__construct($path);
         $this->count = 1;
         
         if(file_exists($this->path)) {
diff --git a/Utils/Barcode/C25.php b/Utils/Barcode/C25.php
index 37322881b..c29cde40f 100644
--- a/Utils/Barcode/C25.php
+++ b/Utils/Barcode/C25.php
@@ -115,6 +115,7 @@ class C25 extends C128Abstract
         $codeString  = '';
         $length      = strlen($this->content);
         $arrayLength = count(self::$CODEARRAY);
+        $temp = [];
 
         for ($posX = 1; $posX <= $length; $posX++) {
             for ($posY = 0; $posY < $arrayLength; $posY++) {
diff --git a/Utils/Barcode/Datamatrix.php b/Utils/Barcode/Datamatrix.php
index ae9806674..0adc98f96 100644
--- a/Utils/Barcode/Datamatrix.php
+++ b/Utils/Barcode/Datamatrix.php
@@ -1,5 +1,5 @@
 <?php
 
-class Aztec
+class Datamatrix
 {
 }
diff --git a/Utils/Permutation.php b/Utils/Permutation.php
index e505badcd..27b1e0640 100644
--- a/Utils/Permutation.php
+++ b/Utils/Permutation.php
@@ -4,7 +4,9 @@ namespace phpOMS\Utils;
 
 class Permutation 
 {
-    // usage: permut(['a', 'b', 'c']);
+    /**
+     * usage: permut(['a', 'b', 'c']);
+     */
     public static function permut(array $toPermute, array $result = []) : array
     {
         $permutations = [];