php下生成验证码的类

演示效果：http://www.ladydig.com/resources/verifycode/index.php?width=160&height=60&length=6

 

字段下载：http://www.ladydig.com/resources/verifycode/Duality.ttf

 

源码下载：http://www.ladydig.com/resources/verifycode/verifycode.rar

 

 

<?phpsession_start();$imgWidth = isset($_REQUEST["width"]) ? intval($_REQUEST["width"]) : 0;$imgHeight = isset($_REQUEST["height"]) ? intval($_REQUEST["height"]) : 0;$length = isset($_REQUEST["length"]) ? intval($_REQUEST["length"]) : 0;$captcha = new VerifyCode(array('width'=>$imgWidth,'height'=>$imgHeight,'length'=>$length));$captcha->CreateImage();class VerifyCode { public $width = 140; public $height = 60; public $glbVerifySeed = "123456789abcdefghigklnmpqrstuvxyz"; public $strLength = 6; public $session_var = 'verifyCode'; public $backgroundColor = array(255, 255, 255); public $colors = array( array(27,78,181), // blue array(22,163,35), // green array(214,36,7), // red array(0,0,0), // black ); public $PolluteNum = 100; public $Yperiod = 10; public $Yamplitude = 8; public $Xperiod = 8; public $Xamplitude = 4; public $maxRotation = 8; public $scale = 2; public $imageFormat = 'png'; public $im; public function __construct($config = array()) { if(intval($config['width'])>50) $this->width = $config['width']; if(intval($config['height'])>20) $this->height = $config['height']; if(intval($config['length'])>2) $this->strLength = $config['length']; if($this->width>150 || $this->height>50) { $this->scale = 1; } $this->PolluteNum = intval($this->width*$this->height/40); } // 创建图片 public function CreateImage() { $ini = microtime(true); $this->ImageAllocate(); $text = $this->GetCaptchaText();$_SESSION[$this->session_var] = $text; $this->WriteText($text);// 写入内容 if($this->height>30) { $this->WaveImage();// 图片变形 }//$this->Pollute();// 画出杂点$this->Line();// 画出一条线 $this->ReduceImage();// 缩放图片 $this->WriteImage();// 输出图片 $this->Cleanup(); } // 初始图片参数 protected function ImageAllocate() { if (!empty($this->im)) { imagedestroy($this->im); } $this->im = imagecreatetruecolor($this->width*$this->scale, $this->height*$this->scale); $this->GdBgColor = imagecolorallocate($this->im, $this->backgroundColor[0], $this->backgroundColor[1], $this->backgroundColor[2] ); imagefilledrectangle($this->im, 0, 0, $this->width*$this->scale, $this->height*$this->scale, $this->GdBgColor); $color = $this->colors[mt_rand(0, sizeof($this->colors)-1)]; $this->GdFgColor = imagecolorallocate($this->im, $color[0], $color[1], $color[2]); } // 获取生成的字母 protected function GetCaptchaText() { $bgnIdx = 0; $endIdx = strlen($this->glbVerifySeed)-1; $code = ""; for($i=0; $i<$this->strLength; $i++) { $curPos = rand($bgnIdx, $endIdx); $code .= substr($this->glbVerifySeed, $curPos, 1); } return $code; } // 写入字母 protected function WriteText($text) { $fontcfg = array( 'spacing' => 0, 'minSize' => $this->height/2+2, 'maxSize' => $this->height/2+4, 'font' => 'Duality.ttf' ); $x = 10*$this->scale; $y = round(($this->height*27/40)*$this->scale); $length = strlen($text); for ($i=0; $i<$length; $i++) { $degree = rand($this->maxRotation*-1, $this->maxRotation); $fontsize = rand($fontcfg['minSize'], $fontcfg['maxSize'])*$this->scale; $letter = substr($text, $i, 1); $coords = imagettftext($this->im, $fontsize, $degree, $x, $y, $this->GdFgColor, $fontcfg['font'], $letter); $x += ($coords[2]-$x) + ($fontcfg['spacing']*$this->scale); } } // 图片变形 protected function WaveImage() { $xp = $this->scale*$this->Xperiod*rand(1,3); $k = rand(0, 100); for ($i = 0; $i < ($this->width*$this->scale); $i++) { imagecopy($this->im, $this->im, $i-1, sin($k+$i/$xp) * ($this->scale*$this->Xamplitude), $i, 0, 1, $this->height*$this->scale); } $k = rand(0, 100); $yp = $this->scale*$this->Yperiod*rand(1,2); for ($i = 0; $i < ($this->height*$this->scale); $i++) { imagecopy($this->im, $this->im, sin($k+$i/$yp) * ($this->scale*$this->Yamplitude), $i-1, 0, $i, $this->width*$this->scale, 1); } } // 缩小图片 protected function ReduceImage() { $imResampled = imagecreatetruecolor($this->width, $this->height); imagecopyresampled($imResampled, $this->im, 0, 0, 0, 0, $this->width, $this->height, $this->width*$this->scale, $this->height*$this->scale ); imagedestroy($this->im); $this->im = $imResampled; } // 输出图片 protected function WriteImage() { if ($this->imageFormat == 'png' && function_exists('imagepng')) { header("Content-type: image/png"); imagepng($this->im); } else { header("Content-type: image/jpeg"); imagejpeg($this->im, null, 80); } } // 画出杂点 protected function Pollute() { $imgWidth = imagesx($this->im); $imgHeight = imagesy($this->im); for($j=0; $j<$this->PolluteNum; $j++) { $x = rand(0, $imgWidth); $y = rand(0, $imgHeight); imagesetpixel($this->im, $x, $y, $this->GdFgColor); } }// 画出一条线protected function Line() {$imgWidth = imagesx($this->im);$imgHeight = imagesy($this->im);$y = ceil($imgHeight/2);$border = floor($imgHeight/20);for($j=10; $j<($imgWidth-10); $j++) {$x = $j;$y = rand(-1,1)+$y;for($i=0; $i<$border; $i++) {imagesetpixel($this->im, $x, $y+$i, $this->GdFgColor);}}} protected function Cleanup() { imagedestroy($this->im); }}?>