php 数值运算验证码 防止破解

<?php/**---------------------------------------------------------------------------*//** PHP 数字运算 验证码类/** @版权注释/** 原创 张灿庭 如果您有任何疑问和想法可以发邮件([e-mail])/** 本类允许转载、复制和修改，但转载、复制和修改的同时请保留原始的出处和作者声明，这也是对作者劳动成果的一种尊重！/**---------------------------------------------------------------------------*/// 开启sessionsession_start(); //头部 防止缓存header("Cache-Control: no-cache, must-revalidate");header("Pragma: no-cache");header('Content-Type:image/gif');//调用类$code = new codeClass();$code->transparent= true;$code->solid= true;$code->pixel= 20;$code->line= 0;$code->arc = 0;$code->dashed= 0;$code->output('authcode');unset($code);class codeClass {public $width = 80;//高度public $height= 20;//宽度public $transparent= true;//透明public $solid= true;//边框public $dashed= 0;//虚线public $arc= 0;//弧线public $line= 0;//直线public $pixel= 0;//干扰点private $img;//对象//输出验证码public function output($name){$this->create();//建立对象$this->drawBg();//白色背景$this->drawAngle();//边框$this->drawPixel();//干扰像素$this->drawLine();//干扰线$this->drawArc();//弧线$this->drawDashed(); //虚线$this->drawText($name); //写入文字//销毁对象imagedestroy($this->img);}//建立对象private function create(){$this->width = empty($this->width) ? 80 : $this->width;$this->height = empty($this->height) ? 20 : $this->height;$this->img = imagecreatetruecolor($this->width, $this->height);imagecolorallocate($this->img, 0, 0, 0);}//背景private function drawBg(){if($this->transparent == true){imagefill($this->img, 0, 0, imagecolorallocate($this->img, 255, 255, 255));//填充白色//imagecolortransparent($this->img, imagecolorallocate($this->img, 255, 255, 255));//背景透明}}//边框private function drawAngle(){//灰色边框if($this->solid == true){imagerectangle($this->img, 0, 0, $this->width-1, $this->height-1, imagecolorallocate($this->img, 204, 204, 204)); }}//输出验证码public function drawText($name){//数组$math= $this->getText();$x = 5;//出生点//循环数组foreach($math[0] as $value){//文字颜色$rgb= $this->getColor();$color = imagecolorallocate($this->img,$rgb['r'], $rgb['g'], $rgb['b']);//位置$y= ($this->height - imagefontwidth(5)) / 2; // Y轴 居中imagestring($this->img, 5, $x, $y, $value, $color);$x = $x + imagefontwidth(5) * strlen($value);// X轴}//保存 session$_SESSION[$name] = $answer;//输出图像imagegif($this->img);}//等式 答案private function getText(){//数值数组$math = array(1,1,1,1,5,6,7,8,9,10,); //随机$x = $math[array_rand($math, 1)];$y = $math[array_rand($math, 1)];$array = array();$array[]= array($x, '+', $y, ' =', '?'); //算术表达式$array[]= $x + $y; //答案return $array;}//文字颜色private function getColor(){$color = array();//暗色$color[]= '#000080';$color[]='#0000EE';$color[]='#008B00';$color[]='#009ACD';$color[]='#191970';$color[]='#1C86EE';$color[]='#2F4F4F';$color[]='#4B0082';//亮色$color[]='#CD0000';$color[]='#8E8E38';$color[]='#A0522D';$color[]='#EE1289';$color[]='#FF0000';$color[]='#FF4500';$rgb= $color[array_rand($color, 1)];return $this->hColor2RGB($rgb);}//转换为rgbfunction hColor2RGB($hexColor) { $color = str_replace('#', '', $hexColor); $rgb= array( 'r' => hexdec(substr($color, 0, 2)), 'g' => hexdec(substr($color, 2, 2)), 'b' => hexdec(substr($color, 4, 2)) );return $rgb;}//绘制椭圆private function drawArc(){if($this->arc > 1){for ($i = 0; $i < $this->arc; $i++){$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255));imagearc($this->img, rand(-$this->width, $this->width), rand(-$this->height, $this->height), $this->width, $this->height, $this->width, $this->height, $color);}}}//绘制虚线private function drawDashed(){if($this->dashed > 1){for ($i = 0; $i < $this->dashed; $i++){$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255));imagedashedline($this->img, rand(0, $this->width), 0, rand(0, $this->width), $this->height, $color);}}}//绘制对角线private function drawLine (){if($this->line > 1){for ($i = 0; $i < $this->line; $i++){$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255));imageline($this->img, rand(0, $this->width), 0, rand(0, $this->width), $this->height, $color);}}}//绘制噪点private function drawPixel(){if($this->pixel > 1){for ($i = 0; $i < $this->pixel; $i++){$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255));imagesetpixel($this->img, rand(0, $this->width), rand(0, $this->height), $color);}}}}?>