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'; /**
* 構造方法
*/
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;
} /**
* 指定字型檔所在路徑，預設為當前檔案夾下arial.ttf檔案
* @param $fontfile 檔案路徑
* @return void
*/
function loadfont($fontfile)
{
$this->fontfile = $fontfile;
} /**
* 圖片輸出方法，在執行本方法前程式不應該有任何形式的輸出
* @return void;
*/
function stroke()
{
$this->savecode();
self::sendheader();
imagegif( $this->validate );
imagedestroy( $this->validate );
imagedestroy( $this->image );
} /**
* 圖片儲存方法
* @param $filename 儲存路徑
* @return void
*/
function save($filename)
{
$this->savecode();
imagegif( $this->validate , $filename );
imagedestroy( $this->validate );
imagedestroy( $this->image );
}
/**
* 驗證碼驗證方法
* @param $input 要驗證的字串，即使用者的輸入內容
* @return boolean 驗證結果
*/
function verify($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;
} /**
* 圖片建立方法
* @return void;
*/
function createimage()
{
$this->randcode();
$size = 30;
$width = 90;
$height = 35;
$degrees = array (
rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 )
);
for ($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)
{
$temp = self::rgbtohsv( rand( 0 , 250 ) , rand( 0 , 150 ) , rand( 0 , 250 ) );
if ($temp[2] > 60) $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; $i < 200; ++$i)
{
$randpixelcolor = imagecolorallocate( $this->validate , rand( 0 , 255 ) , rand( 0 , 255 ) , rand( 0 , 255 ) );
imagesetpixel( $this->validate , rand( 1 , 87 ) , rand( 1 , 35 ) , $randpixelcolor );
}
$temp = self::rgbtohsv( rand( 220 , 255 ) , rand( 220 , 255 ) , rand( 220 , 255 ) );
if ($temp[2] < 200) $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 be used (note the lack of the .ttf extension
imagettftext( $this->image , 15 , 0 , 8 , 20 , $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 ) - 10 , imagesy( $this->image ) - 10 , 100 );
$this->image = imagecreatetruecolor( $size , $size );
imagefilledrectangle( $this->image , 0 , 0 , $size , $size , $back );
imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[1] , $this->fontfile , $this->code[1] );
$this->image = imagerotate( $this->image , $degrees[1] , $back );
imagecolortransparent( $this->image , $back );
imagecopymerge( $this->validate , $this->image , 21 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
$this->image = imagecreatetruecolor( $size , $size );
imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back );
imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[2] , $this->fontfile , $this->code[2] );
$this->image = imagerotate( $this->image , $degrees[2] , $back );
imagecolortransparent( $this->image , $back );
imagecopymerge( $this->validate , $this->image , 41 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
$this->image = imagecreatetruecolor( $size , $size );
imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back );
imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[3] , $this->fontfile , $this->code[3] );
$this->image = imagerotate( $this->image , $degrees[3] , $back );
imagecolortransparent( $this->image , $back );
imagecopymerge( $this->validate , $this->image , 61 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
imagerectangle( $this->validate , 0 , 0 , $width - 1 , $height - 1 , $border );
} |
