diff --git a/.idea/php.xml b/.idea/php.xml
index 31b8a3a..99ff18f 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -1,5 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="MessDetector">
+    <phpmd_settings>
+      <MessDetectorConfiguration tool_path="/usr/bin/phpmd" />
+    </phpmd_settings>
+  </component>
+  <component name="PhpCodeSniffer">
+    <phpcs_settings>
+      <PhpCSConfiguration standards="MySource;PEAR;PSR1;PSR12;PSR2;Squiz;Zend" tool_path="/usr/bin/phpcs" />
+    </phpcs_settings>
+  </component>
   <component name="PhpProjectSharedConfiguration" php_language_level="8.0">
     <option name="suggestChangeDefaultLanguageLevel" value="false" />
   </component>
diff --git a/index.php b/index.php
index b0b412c..0277110 100755
--- a/index.php
+++ b/index.php
@@ -13,6 +13,7 @@
             <nav>
                 <a href="lessons/lesson1.php">урок 1</a>
                 <a href="lessons/lesson2.php">урок 2</a>
+                <a href="lessons/lesson3.php">урок 3</a>
             </nav>
             <p>Всем привет! Добро пожаловать на мой первый сайт.
             </p>
diff --git a/lessons/classes/StringLib.php b/lessons/classes/StringLib.php
new file mode 100644
index 0000000..d7deef3
--- /dev/null
+++ b/lessons/classes/StringLib.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Utils;
+
+class StringLib
+{
+
+    private const DEFAULT_CHARSET = 'UTF-8';
+
+    public static function mbReverseString(
+        string $text,
+        string $encoding = self::DEFAULT_CHARSET
+    ): string {
+        $convertTextToWin = mb_convert_encoding($text, 'windows-1251', $encoding);
+        $reverseText = strrev($convertTextToWin);
+
+        return mb_convert_encoding($reverseText, $encoding, 'windows-1251');
+    }
+}
diff --git a/lessons/classes/TableUtils.php b/lessons/classes/TableUtils.php
index 7f487fa..77c1dcf 100644
--- a/lessons/classes/TableUtils.php
+++ b/lessons/classes/TableUtils.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Utils;
+
 class TableUtils
 {
 
@@ -14,7 +16,8 @@ class TableUtils
         4 => 'blue-text'
     ];
 
-    public static function renderTable(bool $styled = false): string {
+    public static function renderTable(bool $styled = false): string
+    {
         $cells = '';
 
         for ($leftOperand = self::$minOperand; $leftOperand <= self::$maxOperand; $leftOperand++) {
@@ -24,7 +27,8 @@ public static function renderTable(bool $styled = false): string {
         return $cells;
     }
 
-    private static function getCell(int $leftOperand, bool $styled): string {
+    private static function getCell(int $leftOperand, bool $styled): string
+    {
         $content = '';
 
         for ($rightOperand = self::$minOperand; $rightOperand <= self::$maxOperand; $rightOperand++) {
@@ -33,13 +37,14 @@ private static function getCell(int $leftOperand, bool $styled): string {
             $result = $leftOperand * $rightOperand;
             $resultStyled = $styled ? self::getNumbersStyled($result) : $result;
 
-            $string = $leftOperandStyled ." x ". $rightOperandStyled ." = ". $resultStyled;
+            $string = $leftOperandStyled . " x " . $rightOperandStyled . " = " . $resultStyled;
             $content .= self::addBr($string);
         }
         return $content;
     }
 
-    private static function addNewRowInTable(int $currentCell, string $content) : string {
+    private static function addNewRowInTable(int $currentCell, string $content): string
+    {
         return $currentCell == 5 ? $content . '</tr><tr>' : $content;
     }
 
@@ -53,13 +58,15 @@ private static function addTd(string $text): string
         return '<td>' . $text . '</td>';
     }
 
-    private static function changeColor(int $number): string {
+    private static function changeColor(int $number): string
+    {
         $class = isset(self::$colors[$number]) ? self::$colors[$number] : 'default-color';
 
         return '<span class="' . $class . '">' . $number . '</span>';
     }
 
-    private static function getNumbersStyled(int $number): string {
+    private static function getNumbersStyled(int $number): string
+    {
         $numbersStyled = '';
         $stringWithNumbers = strval($number);
 
diff --git a/lessons/handler.php b/lessons/handler.php
new file mode 100644
index 0000000..c6c31fb
--- /dev/null
+++ b/lessons/handler.php
@@ -0,0 +1,30 @@
+<!DOCTYPE  html>
+<html lang="ru">
+<head>
+    <title>Beginner level</title>
+    <meta charset="utf-8">
+    <link rel="stylesheet" href="../style.css">
+</head>
+<body>
+<p>
+<?php
+
+include 'classes/StringLib.php';
+
+use Utils\StringLib;
+
+$result = 'Вы не ввели текст!';
+$string = $_POST['string'];
+
+if (isset($string) && !empty($_POST['string'])) {
+        $text = trim($_POST['string']);
+        $reverseText = StringLib::mbReverseString($text);
+        $result = $reverseText;
+}
+
+echo $result;
+?>
+</p>
+<a href="lesson3.php">Назад</a>
+</body>
+</html>
\ No newline at end of file
diff --git a/lessons/lesson1.php b/lessons/lesson1.php
index a415c2b..5d9edad 100644
--- a/lessons/lesson1.php
+++ b/lessons/lesson1.php
@@ -1,7 +1,3 @@
-<?php
-
-include 'classes/TableUtils.php';
-?>
 <!DOCTYPE  html>
 <html lang="ru">
 <head>
@@ -12,7 +8,14 @@
 <body>
 <table>
     <tr>
-        <?=TableUtils::renderTable();?>
+        <?php
+
+            include 'classes/TableUtils.php';
+
+            use Utils\TableUtils;
+
+            echo TableUtils::renderTable();
+        ?>
     </tr>
  </table>
 </body>
diff --git a/lessons/lesson2.php b/lessons/lesson2.php
index 96cc316..95bce26 100644
--- a/lessons/lesson2.php
+++ b/lessons/lesson2.php
@@ -1,7 +1,3 @@
-<?php
-
-include 'classes/TableUtils.php';
-?>
 <!DOCTYPE  html>
 <html lang="ru">
 <head>
@@ -12,7 +8,14 @@
 <body>
 <table>
     <tr>
-        <?=TableUtils::renderTable(true);?>
+        <?php
+
+            include 'classes/TableUtils.php';
+
+            use Utils\TableUtils;
+
+            echo TableUtils::renderTable(true);
+        ?>
     </tr>
 </table>
 </body>
diff --git a/lessons/lesson3.php b/lessons/lesson3.php
new file mode 100644
index 0000000..5e3fd76
--- /dev/null
+++ b/lessons/lesson3.php
@@ -0,0 +1,21 @@
+<!DOCTYPE  html>
+<html lang="ru">
+<head>
+    <title>Beginner level</title>
+    <meta charset="utf-8">
+    <link rel="stylesheet" href="../style.css">
+</head>
+<body>
+<form method="POST" action="handler.php">
+    Введите текст:<br/>
+    <div class="input-field">
+        <label>
+            <input type="text" name="string">
+        </label>
+    </div>
+    <div class="input-field">
+        <input type="submit" value="Отправить">
+    </div>
+</form>
+</body>
+</html>
\ No newline at end of file
diff --git a/style.css b/style.css
index e8a7eda..f8e3830 100644
--- a/style.css
+++ b/style.css
@@ -46,4 +46,8 @@ table {
 
 .yellow-text {
     color: yellow;
+}
+
+.input-field {
+    margin: 10px 0 10px 0;
 }
\ No newline at end of file