PHP code class learning

<? PHP
 $ code = new new Code ();
 $ code -> outImage ();
 class Code 
{ 
    // verify the number of code 
    protected  $ Number ;
     // this code type 
    protected  $ CodeType ;
     // image width 
    protected  $ width ;
     / / image height 
    protected  $ height ;
     // image resource 
    protected  $ image ;
     // this code string 
    protected  $ code ; 

    / * * 
     * function Undocumented 
     *
     * @param integer $number
     * @param integer $codeType
     * @param integer $width
     * @param integer $height
     */
    public function __construct($number = 4, $codeType = 2, $width = 100, $height = 50)
    {
        //初始化自己的成员属性
        $this->number = $number;
        $this->codeType = $codeType;
        $this->width = $width;
        $this->height = $height;

        //Function codes generated 
        $ the this -> code = $ the this -> the createCode (); 
    } 

    / * * 
     * destructor 
     * image resource release 
     * / 
    public  function __destruct () 
    { 
        // release image resource 
        imagedestroy ( $ the this -> Image ); 
    } 

    
    / * * 
     * // protected by magic method of acquiring the object code 
     * $ code = new new code (); 
     * $ echo 3rd field - code> code; 
     * 
     * @param [type] $ name 
     * @return void 
     * / 
    public  function the __get ( $ name ) 
    { 
        IF (name $ == 'code' ) {
             return  $ the this -> code; 
        } 
        return  to false ; 
    } 

    / * * 
     * get Code 
     * 
     * @return void 
     * / 
    protected  function the createCode () 
    { 
        // through your verification code type to you generate different codes 
        Switch ( $ the this -> CodeType) {
             Case 0:   // pure digital 
                $ code = $ the this -> getNumberCode ();
                 BREAK ;
             Case . 1:  // pure letters 
                $ code = $ the this -> getCharCode ();
                 BREAK ;
             Case 2:   // letters, and numbers 
                $ code = $ the this -> getNumCharCode ();
                 BREAK ;
             default :
                 Die ( 'these codes do not type ' ); 
        } 
        return  $ code ; 
    } 

    / * * 
     * yield pure digital codes 
     * 
     * @return void 
     * / 
    protected  function getNumberCode () 
    { 
        // $startNum = pow(10, $this->number - 1);
        // $endNum = pow(10, $this->number) - 1;
        // $str = rand($startNum, $endNum);
        // return $str;
        $str = join('', range(0, 9));
        return substr(str_shuffle($str), 0, $this->number);
    }

    /**
     * 生成纯字母验证码
     *
     * @return void
     */
    protected function getCharCode()
    {
        $str = join('', range( 'A', 'Z' ));
         $ STR = $ STR . the strtoupper ( $ STR );
         return  substr ( str_shuffle ( $ STR ), 0, $ the this -> Number ); 
    } 

    / * * 
     * generate alphanumeric codes 
     * 
     * @return void 
     * / 
    protected  function getNumCharCode () 
    { 
        $ numstr = the Join ( '', Range (0,. 9 ));
         $ STR = the Join ( '', Range('a', 'z'));
        $str = $numStr . $str . strtoupper($str);
        return substr(str_shuffle($str), 0, $this->number);
    }

    /**
     * 创建画布
     *
     * @return void
     */
    protected function createImage()
    {
        $this->image = imagecreatetruecolor($this->width, $this->height);
    }

    /**
     * Fill the background color 
     * 
     * @return void 
     * / 
    protected  function fillBack () 
    { 
        ImageFill ( $ the this -> Image, 0, 0, $ the this -> lightColor ()); 
    } 

    / * * 
     * randomly generated light color 
     * 
     * @ void return 
     * / 
    protected  function lightColor () 
    { 
        return imagecolorallocate ( $ the this -> Image, the mt_rand (130., 255), the mt_rand (130., 255), the mt_rand (130., 255 )); 
    } 

    / *  *
     * a dark color randomly generated
     * 
     * @Return void 
     * / 
    protected  function darkColor () 
    { 
        return imagecolorallocate ( $ the this -> Image, the mt_rand (0, 120), the mt_rand (0, 120), the mt_rand (0, 120 )); 
    } 

    / * * 
     * The Videos string codes into the canvas 
     * 
     * @return void 
     * / 
    protected  function 's drawChar () 
    { 
        $ width = ceil ( $ the this -> width / $ the this -> Number );
         for ( $ I = 0; $i < $this->number; $i++) {
            $x = mt_rand($i * $width+5, ($i + 1) * $width - 10);
            $y = mt_rand(0, $this->height - 15);
            imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor());
        }
    }

    /**
     * 添加干扰项
     *
     * @return void
     */
    protected function drawDisturb()
    {
        for ($i = 0; $i < 150; $i++) {
            $x = mt_rand(0, $this->width);
            $y = mt_rand(0, $this->height);
            imagesetpixel($this->image, $x, $y, $this->lightColor());
        }
    } 

    / **
     * And outputs display 
     * 
     * @return void 
     * / 
    protected  function Show () 
    { 
        header ( 'the Content-the Type: Image / PNG' ); 
        imagepng ( $ the this -> Image); 
    } 

    public  function outImage () 
    { 
        // create a canvas 
        the this $ -> the createImage ();
         // fill the background color 
        $ the this -> fillBack ();
         // the character string codes into the canvas painting 
        $ the this -> 's drawChar ();
         // add distracter 
        $ the this ->drawDisturb ();
         //And displaying output 
        $ the this -> Show (); 
    } 
}

running result: