zf驗證碼類（Zend_Captcha_Image）

可先重再captcha類,減少噪點

 /** * 重載captcha類 * */ class MyImage extends Zend_Captcha_Image { protected $_dotNoiseLevel = 10; protected function _generateImage($id, $word) { if (!extension_loaded("gd")) { require_once 'Zend/Captcha/Exception.php'; throw new Zend_Captcha_Exception("Image CAPTCHA requires GD extension"); } if (!function_exists("imagepng")) { require_once 'Zend/Captcha/Exception.php'; throw new Zend_Captcha_Exception("Image CAPTCHA requires PNG support"); } if (!function_exists("imageftbbox")) { require_once 'Zend/Captcha/Exception.php'; throw new Zend_Captcha_Exception("Image CAPTCHA requires FT fonts support"); } $font = $this->getFont(); if (empty($font)) { require_once 'Zend/Captcha/Exception.php'; throw new Zend_Captcha_Exception("Image CAPTCHA requires font"); } $w = $this->getWidth(); $h = $this->getHeight(); $fsize = $this->getFontSize(); $img_file = $this->getImgDir() . $id . $this->getSuffix(); if(empty($this->_startImage)) { $img = imagecreatetruecolor($w, $h); } else { $img = imagecreatefrompng($this->_startImage); if(!$img) { require_once 'Zend/Captcha/Exception.php'; throw new Zend_Captcha_Exception("Can not load start image"); } $w = imagesx($img); $h = imagesy($img); } $text_color = imagecolorallocate($img, 0, 0, 0); $bg_color = imagecolorallocate($img, 255, 153, 0); imagefilledrectangle($img, 0, 0, $w-1, $h-1, $bg_color); $textbox = imageftbbox($fsize, 0, $font, $word); $x = ($w - ($textbox[2] - $textbox[0])) / 2; $y = ($h - ($textbox[7] - $textbox[1])) / 2; imagefttext($img, $fsize, 0, $x, $y, $text_color, $font, $word); // generate noise for ($i=0; $i<$this->_dotNoiseLevel; $i++) { imagefilledellipse($img, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color); } for($i=0; $i<$this->_lineNoiseLevel; $i++) { imageline($img, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color); } // transformed image $img2 = imagecreatetruecolor($w, $h); $bg_color = imagecolorallocate($img2, 255, 255, 255); imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color); // apply wave transforms $freq1 = $this->_randomFreq(); $freq2 = $this->_randomFreq(); $freq3 = $this->_randomFreq(); $freq4 = $this->_randomFreq(); $ph1 = $this->_randomPhase(); $ph2 = $this->_randomPhase(); $ph3 = $this->_randomPhase(); $ph4 = $this->_randomPhase(); $szx = $this->_randomSize(); $szy = $this->_randomSize(); for ($x = 0; $x < $w; $x++) { for ($y = 0; $y < $h; $y++) { $sx = $x + (sin($x*$freq1 + $ph1) + sin($y*$freq3 + $ph3)) * $szx; $sy = $y + (sin($x*$freq2 + $ph2) + sin($y*$freq4 + $ph4)) * $szy; if ($sx < 0 || $sy < 0 || $sx >= $w - 1 || $sy >= $h - 1) { continue; } else { $color = (imagecolorat($img, $sx, $sy) >> 16) & 0xFF; $color_x = (imagecolorat($img, $sx + 1, $sy) >> 16) & 0xFF; $color_y = (imagecolorat($img, $sx, $sy + 1) >> 16) & 0xFF; $color_xy = (imagecolorat($img, $sx + 1, $sy + 1) >> 16) & 0xFF; } if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) { // ignore background continue; } elseif ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) { // transfer inside of the image as-is $newcolor = 0; } else { // do antialiasing for border items $frac_x = $sx-floor($sx); $frac_y = $sy-floor($sy); $frac_x1 = 1-$frac_x; $frac_y1 = 1-$frac_y; $newcolor = $color * $frac_x1 * $frac_y1 + $color_x * $frac_x * $frac_y1 + $color_y * $frac_x1 * $frac_y + $color_xy * $frac_x * $frac_y; } imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newcolor, $newcolor, $newcolor)); } } // generate noise for ($i=0; $i<$this->_dotNoiseLevel; $i++) { imagefilledellipse($img2, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color); } for ($i=0; $i<$this->_lineNoiseLevel; $i++) { imageline($img2, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color); } imagepng($img2, $img_file); imagedestroy($img); imagedestroy($img2); } }

添加插件類

/** * Zend_captcha驗證碼 * */ class Custom_Controller_Plugin_Imgcode extends Zend_Controller_Plugin_Abstract { public $word; public $imgdir; public $imgname; public $suffix; public function __construct(){ Zend_Loader::loadClass('MyImage'); $codeSession = new Zend_Session_Namespace('imgcode'); //在默認構造函數裏實例化 $captcha = new MyImage(array('font'=>'./public/images/arial.ttf', //字體文件路徑 'fontsize'=>24, //字號 'imgdir'=>'./public/images/code/', //驗證碼圖片存放位置 'session'=>$codeSession, //驗證碼session值 'width'=>120, //圖片寬 'height'=>50, //圖片高 'wordlen'=>5 )); //字母數 $captcha->setExpiration(5); //每5秒 $captcha->setGcFreq(1); //百分百刪除舊文件 $captcha->generate(); //生成圖片 $codeSession->word = $captcha->getWord(); $this->imgdir = $captcha->getImgdir(); //圖像路徑 $this->imgname = $captcha->getId(); //獲取文件名，md5編碼 $this->word = $captcha->getWord(); //認證碼 $this->suffix= $captcha->getSuffix(); } public function getImgurl(){ return $this->imgdir.$this->imgname.$this->suffix; } public function getImgname(){ return $this->imgname; } public function getWord(){ return $this->word; } }