MathType

Формуляр и обработчик 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Демонстрация на Bootstrap</title>
        <!-- Latest compiled and minified CSS -->
        <link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
crossorigin="anonymous">

        <!-- Minified jQuery -->
        <script src="https://code.jquery.com/jquery-3.1.1.min.js"
integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
crossorigin="anonymous"></script>

        <!-- Latest compiled and minified JavaScript -->
        <script
src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"
integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
crossorigin="anonymous"></script>
    </head>
    <body>
        
        <?php 
        if (!isset($_REQUEST['chas'])) {
            //Тук е нашият формуляр, който ще изведем само ако нямаме вече 
            //изпратени параметри. Т.е. викат ни за първи път.
        ?>
            
        <div class="container-fluid">
            <div class="row">
                <div class="col-md-12">
                    <!-- Тук ще поставим нашия формуляр -->
                    <form>
                      <div class="form-group">
                        <label for="chas">Час</label>
                        <input type="text" class="form-control" id="chas" name="chas"
                               placeholder="Въведете кръгъл час..." >
                      </div>
                      <div class="form-group">
                        <label for="pluschasa">+ часа</label>
                        <input type="text" class="form-control" id="pluschasa" name="pluschasa"
                               placeholder="След ... часа">
                        <p> ще бъде ...</p>
                      </div>

                        <button type="submit" class="btn btn-warning" 
                                formaction="index.php" formmethod="get">Изчисли</button>
                    </form>  
                </div>
            </div>
        </div>

        <?php
        } else {
            //Ние идваме тук ако горния израз е false, а той е false
            //само ако $_REQUEST['chas'] съществува ...
            echo "Сега е ${_REQUEST['chas']}. ";
            echo "След ${_REQUEST['pluschasa']} ще бъде";
            echo ($_REQUEST['chas'] + $_REQUEST['pluschasa']) % 24;
        }
        ?>
        

        
    </body>
</html>

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