PHP generates code class codes for validation code

Class SecureCode
{
private static $instance =null;
Private $code = ';
Private $fontfile;
Private $validate;
Private $image;
Private $specialadd = ' special string for SecureCode ';
Private $codeexpire = 86400;
Private $codecookiename = ' secure_code ';

/**
* Construction Method
*/
Private Function SecureCode ()
{
$this->fontfile = dirname (__file__). '/arial.ttf ';
}

    Private Function __construct ()
    {
         $this->securecode ();
   }
   
    public static function getinstance ()
    {
         if (self:: $instance ==null)
             self:: $instance =new self ();
       
        return self::$ Instance
   }

   /**
     * Specifies the path to the font file, which defaults to the current folder under Arial.ttf file
      * @param $fontfile file path
     * @return void
     */
 &nbs p;  function Loadfont ($fontfile)
    {
        $this- >fontfile = $fontfile;
   }

/**
* Image output method, before executing this method the program should not have any form of output
* @return void;
*/
function Stroke ()
{
$this->savecode ();
Self::sendheader ();
Imagegif ($this->validate);
Imagedestroy ($this->validate);
Imagedestroy ($this->image);
}

/**


* Picture Save method


* @param $filename Save path


* @return void


*/


function Save ($filename)


{


$this->savecode ();


Imagegif ($this->validate, $filename);


Imagedestroy ($this->validate);


Imagedestroy ($this->image);


}





/**


* Verification Code Verification method


* @param $input The string to be validated, that is, what the user is entering


* @return Boolean validation results


*/


function Verify ($input)


{


$input =strtolower ($input);


$targetcode = $this->authcode ($input);


$code = $this->getcookie ();


if (Empty ($code) | | $code!= $targetcode)


$result = false;


Else


$result =true;


$_cookie[$this->codecookiename]= ';


Setcookie ($this->codecookiename, ',-1);


return $result;


}

/**
* Image Creation Method
* @return void;
*/
function CreateImage ()
{
$this->randcode ();

$size = 30;
$width = 90;
$height = 35;
$degrees = Array (
Rand (0), rand (0,), rand (0,), rand (0, 30)
);

for ($i = 0; $i < 4; + + $i)


{


if (rand ()% 2);


else $degrees [$i] =-$degrees [$i];


}





$this->image = Imagecreatetruecolor ($size, $size);


$this->validate = Imagecreatetruecolor ($width, $height);


$back = Imagecolorallocate ($this->image, 255, 255, 255);


$border = Imagecolorallocate ($this->image, 0, 0, 0);


Imagefilledrectangle ($this->validate, 0, 0, $width, $height, $back);





for ($i = 0; $i < 4; + + $i)


{


$temp = SELF::RGBTOHSV (rand (0), rand (0,), rand (0, 250));





if ($temp [2] >) $temp [2] = 60;





$temp = Self::hsvtorgb ($temp [0], $temp [1], $temp [2]);


$textcolor [$i] = imagecolorallocate ($this->image, $temp [0], $temp [1], $temp [2]);


}





for ($i = 0; $i < + + $i)


{


$randpixelcolor = Imagecolorallocate ($this->validate, rand (0, 255), rand (0, 255), rand (0, 255));


Imagesetpixel ($this->validate, rand (1,), rand (1), $randpixelcolor);


}





$temp = SELF::RGBTOHSV (rand, 255), Rand (255), rand (220, 255));





if ($temp [2] <) $temp [2] = 255;





$temp = Self::hsvtorgb ($temp [0], $temp [1], $temp [2]);


$randlinecolor = Imagecolorallocate ($this->image, $temp [0], $temp [1], $temp [2]);





Self::imagelinethick ($this->validate, $textcolor [rand (0, 3)]);





Imagefilledrectangle ($this->image, 0, 0, $size, $size, $back);


Putenv (' gdfontpath= '. Realpath ('. '));





Name the font to is used (note the lack of the. ttf extension


Imagettftext ($this->image, 0, 8, $textcolor [0], $this->fontfile, $this->code[0]);





$this->image = imagerotate ($this->image, $degrees [0], $back);


Imagecolortransparent ($this->image, $back);


Imagecopymerge ($this->validate, $this->image, 1, 4, 4, 5, Imagesx ($this->image)-Imagesy ($this-&G T;image)-10, 100);





$this->image = Imagecreatetruecolor ($size, $size);


Imagefilledrectangle ($this->image, 0, 0, $size, $size, $back);


Imagettftext ($this->image, 0, 8, $textcolor [1], $this->fontfile, $this->code[1]);


$this->image = imagerotate ($this->image, $degrees [1], $back);


Imagecolortransparent ($this->image, $back);


Imagecopymerge ($this->validate, $this->image, 4, 4, 5, Imagesx ($this->image)-Imagesy ($this-& Gt;image)-10, 100);





$this->image = Imagecreatetruecolor ($size, $size);


Imagefilledrectangle ($this->image, 0, 0, $size-1, $size-1, $back);


Imagettftext ($this->image, 0, 8, $textcolor [2], $this->fontfile, $this->code[2]);


$this->image = imagerotate ($this->image, $degrees [2], $back);


Imagecolortransparent ($this->image, $back);


Imagecopymerge ($this->validate, $this->image, 4, 4, 5, Imagesx ($this->image)-Imagesy ($this-& Gt;image)-10, 100);





$this->image = Imagecreatetruecolor ($size, $size);


Imagefilledrectangle ($this->image, 0, 0, $size-1, $size-1, $back);


Imagettftext ($this->image, 0, 8, $textcolor [3], $this->fontfile, $this->code[3]);


$this->image = imagerotate ($this->image, $degrees [3], $back);


Imagecolortransparent ($this->image, $back);


Imagecopymerge ($this->validate, $this->image, 4, 4, 5, Imagesx ($this->image)-Imagesy ($this-& Gt;image)-10, 100);


Imagerectangle ($this->validate, 0, 0, $width-1, $height-1, $border);


}





/**


* Get the randomly generated verification code


* @return String Random Authentication code, the returned verification code does not do any processing


*/


function GetCode ()


{


return $this->code;


}

/**
* Generate Random Code method
* @return void;
*/
protected function Randcode ()
{
$alphastr = ' abcdefghijklmnpqrstuvwxyz123456789 ';
$randstr = Array (
$ALPHASTR {rand (0)}, $alphastr {rand (0)}, $alphastr {rand (0,)}, $alphastr {rand (0, 33)}
);
$this->code = strtolower ($randstr [0]. $randstr [1]. $randstr [2]. $randstr [3]);
}

/**


* RGB color to the HSV color conversion method


* @param $r


* @param $g


* @param $b


* @return Array HSV arrays


*/


protected static function Rgbtohsv ($r, $g, $b)


{


$tmp = min ($r, $g);


$min = min ($tmp, $b);


$tmp = Max ($r, $g);


$max = Max ($tmp, $b);


$v = $max;


$delta = $max-$min;





if ($max!= 0) $s = $delta/$max; S


Else


{


$s = 0;


$h = Undefinedcolor;


Return


}


if ($r = = $max) $h = ($g-$b)/$delta; Between Yellow & Magenta


else if ($g = = $max) $h = 2 + ($b-$r)/$delta; Between Cyan & Yellow


else $h = 4 + ($r-$g)/$delta; Between Magenta & Cyan

$h *= 60; Degrees
if ($h < 0) $h + = 360;
Return Array (
$h, $s, $v
);
}

/**


* The same method functions the opposite


* @param $h


* @param $s


* @param $v


* @return Array RGB


*/


protected static function Hsvtorgb ($h, $s, $v)


{


if ($s = = 0)


{


Achromatic (Grey)


$r = $g = $b = $v;


Return


}





$h/= 60; Sector 0 to 5


$i = Floor ($h);


$f = $h-$i; Factorial part of H


$p = $v * (1-$s);


$q = $v * (1-$s * $f);


$t = $v * (1-$s * (1-$f));





Switch ($i)


{


Case 0:


$r = $v;


$g = $t;


$b = $p;


Break


Case 1:


$r = $q;


$g = $v;


$b = $p;


Break


Case 2:


$r = $p;


$g = $v;


$b = $t;


Break


Case 3:


$r = $p;


$g = $q;


$b = $v;


Break


Case 4:


$r = $t;


$g = $p;


$b = $v;


Break


Default://Case 5:


$r = $v;


$g = $p;


$b = $q;


Break


}


Return Array (


$r, $g, $b


);


}

/**
* How to save the authentication code using cookies
* @return void
*/
protected function Savecode ()
{
$code = $this->authcode ($this->code);
$this->setcookie ($code);
}

/**


* Authentication Code Cookie Value acquisition method


* @return String Cookie value


*/


protected function GetCookie ()


{


if (Empty ($_cookie[$this-&gt;codecookiename]))


{


Return ";


}


Else


{


Return addslashes ($_cookie[$this-&gt;codecookiename]);


}


}





/**


* Verification Code Cookie Creation method


* @param string $code The authentication code to be saved


* @return void


*/


protected function Setcookie ($code)


{


$expire = $this-&gt;codeexpire &gt; 0? $this-&gt;codeexpire + Time (): 0;


Setcookie ($this-&gt;codecookiename, $code, $expire);


}





/**


* Verification Code encryption method


* @param string $code The random code to encrypt


* @return Mixed execution Results


*/


protected function Authcode ($code)


{


return MD5 ($code. $this-&gt;specialadd);


}





/**


* Interference Line Generation method


* @param resource $image picture resource handle


* @param string $color interference line Color


*/


protected static function Imagelinethick ($image, $color)


{


$k = rand (5, 20);


for ($px = 0; $px &lt; $px = $px + 1)


{


$y = $k * Sin (0.1 * ($px)); $y =200+10*sin (0.1* ($PX-200));


for ($i = 0; $i &lt; 2; $i + +)


{


Imagesetpixel ($image, $px, $y + + $i, $color);


}





}


}

/**
* HTTP Header Setup method
* @return void
*/
protected static function Sendheader ()
{
Header ("Pragma:no-cache");
Header ("cache-control:max-age=1, s-maxage=1, No-cache, must-revalidate");
Header (' content-type:image/gif ');
}
}
Http://down.111cn.net/down/code/php/qitayuanma/2010/1220/22330.html