Классы(4 вариант/Жадыра)

<?php
    class Detal {
        var $VreamyaIzgotovlenya;
        var $Razmer;
        var $Cena;

        function Detal($a, $b, $c) {
            $this->VreamyaIzgotovlenya = $a;
            $this->Razmer = $b;
            $this->Cena = $c;
        }

        function Show() {
            echo "VreamyaIzgotovlenya = $this->VreamyaIzgotovlenya <br>";
            echo "Razmer = $this->Razmer <br>";
            echo "Cena = $this->Cena <br>";
        }
    }

    class Mehanizm extends Detal {
        var $ColvoDetalej;
        var $VeroyatnostPolomki;

        function Mehanizm($a, $b, $c, $d, $e) {
            parent::Detal($a,$b,$c);
            $this->ColvoDetalej = $d;
            $this->VeroyatnostPolomki = $e;
        }

        function Show() {
            parent::Show();
            echo "ColvoDetalej = $this->ColvoDetalej <br>";
            echo "VeroyatnostPolomki = $this->VeroyatnostPolomki <br>";
        }
    }

    class Izdelie extends Detal {
        var $SlojnostIzgotovlenya;

        function Izdelie($a,$b,$c,$d) {
            parent::Detal($a,$b,$c);
            $this->SlojnostIzgotovlenya = $d;
        }

        function Show() {
            parent::Show();
            echo "SlojnostIzgotovlenya = $this->SlojnostIzgotovlenya <br>";
        }
    }

    class Yzel extends Detal {
        var $SvazanoDelatej;

        function Yzel($a,$b,$c,$d) {
            parent::Detal($a,$b,$c);
            $this->SvazanoDelatej = $d;
        }

        function Show() {
            parent::Show();
            echo "SvazanoDelatej = $this->SvazanoDelatej <br>";
        }
    }

    if ( !isset($_REQUEST['type']) or (@$_REQUEST['type'] == '') ){
        echo "<form action='index.php' method='get'>";
        echo "<input type=radio name='type' value='Mehanizm'> Механизм <br>";
        echo "<input type=radio name='type' value='Izdelie'> Изделие <br>";
        echo "<input type=radio name='type' value='Yzel'> Узел <br>";
        echo "<input type=submit value='Выбрать'>";
        echo "</form>";
    }
    else{
        eval('@$DetalObj = new '.$_REQUEST['type'].';');
        $Vars = get_class_vars(get_class($DetalObj));

        if ( !isset($_REQUEST['sohr']) or (@$_REQUEST['sohr'] == '') ){
            echo "<form action='index.php' method='get'>";

            foreach($Vars as $Name => $Val)
                echo "$Name = <input type=text name='$Name'> <br>";

            echo '<input type=submit value="Сохранить">';
            echo '<input type=hidden name="type" value="'.$_REQUEST['type'].'">';
            echo '<input type=hidden name="sohr" value="1">';
            echo "</form>";
        }

        if ( @$_REQUEST['sohr'] == '1' ){
            foreach($Vars as $Name => $Val)
                if ( isset($_REQUEST[$Name]) and ($_REQUEST[$Name] != '') )
                    eval('$DetalObj->'.$Name.' = "'.$_REQUEST[$Name].'";');

            $DetalObj->Show();

            echo "<form action='index.php' method='get'>";
            echo "<input type=submit value='Категории'>";
            echo "</form>";
        }
    }
?>