php学习笔记（十五）验证码类的编写和使用

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<?php    session_start();    echo @$_POST["code"]."<br>";    echo $_SESSION["code"]."<br>";        if (strtoupper($_POST["code"])==strtoupper($_SESSION["code"])){        echo "ok";    }else{        echo "error";    }?>

<html><body><br><form action="imagecode.php" method="post">    <input type="text" name="code" onkeyup="if(this.value!=this.value.toUpperCase())this.value=this.value.toUpperCase()"><img alt="验证码" src="validationcode.php" onclick="this.src='validationcode.php?'+Math.random()"><br>    <input type="submit" value="sub"></form></body></html>

<?php    session_start();    include 'validationcode.class.php';    $code = new ValidationCode();    $code->showImage();    $_SESSION["code"] = $code->getCheckCode();?>

<?php    class ValidationCode{        private $width;        private $height;        private $codeNum;        private $image;        private $disturbColorNum;        private $checkCode;                function __construct($width=80,$height=20,$codeNum=4){            $this->width = $width;            $this->height = $height;            $this->codeNum = $codeNum;            $this->checkCode = $this->createCode();            //取整数            $this->disturbColorNum = floor($width*$height/15);        }            /**         * 向浏览器中输出验证码         */        function showImage($fontface=""){            //第一步：创建图像背景            $this->getCreateImage();            //第二步：设置干扰元素            $this->setDisturColor();            //第三步：想图像中画出文本            $this->outPutText($fontface);            //第四部：输出图像            $this->outPutImage();        }        /**         * 获取验证码上的字符串         */        function getCheckCode(){            return $this->checkCode;        }        /**         * 创建图像         */        private function getCreateImage(){            //创建图像资源            $this->image = imagecreatetruecolor($this->width, $this->height);            //随即背景色            $backColor = imagecolorallocate($this->image, rand(180, 225), rand(180, 225), rand(180, 225));            //填充背景颜色            imagefill($this->image, 0, 0, $backColor);            //设置边框颜色            $border = imagecolorallocate($this->image, 0, 0, 0);            //画出边框            imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);        }        /**         * 创建干扰元素         */        private function setDisturColor(){            for ($i = 0; $i < $this->disturbColorNum; $i++) {                //设置颜色                $color = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));                imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);            }            for ($i = 0; $i < 10; $i++) {                //设置颜色                $color = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));                imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(30, 200), 50, 40, $color);            }        }        /**         * 创建输出文本         */        private function outPutText($fontface=""){            for ($i = 0; $i < $this->codeNum; $i++) {                $color = imagecolorallocate($this->image, rand(0, 150), rand(0, 150), rand(0, 150));                if ($fontface==""){                    $font = rand(3, 5);                    $x = floor($this->width/$this->codeNum)*$i+3;                    $y = rand(0, $this->height-15);                    imagechar($this->image, $font, $x, $y, $this->checkCode{$i}, $color);                }else{                    $size = rand(12, 15);                    $angle = rand(-30, 30);                    $x = floor(($this->width-8)/$this->codeNum)*$i+8;                    $y = rand($size, $this->height);                    imagettftext($this->image, $size, $angle, $x, $y, $color, $fontface, $this->checkCode{$i});                }            }        }        private function createCode(){            $code = "23456789qwertyuipkjhgfdsazxcvbnmQWERTYUPLKJHGFDSAZXCVBNM";            $str = '';            for ($i = 0; $i < $this->codeNum; $i++) {                $char = $code{rand(0, strlen($code)-1)};                $str .= $char;            }            return $str;        }        /**         * 创建输出图像         */        private function outPutImage(){            if (imagetypes() & IMG_GIF){                header("Content-Type:image/gif");                imagegif($this->image);            }else if (imagetypes() & IMG_JPG){                header("Content-Type:image/jpeg");                imagejpeg($this->image);            }else if (imagetypes() & IMG_PNG){                header("Content-Type:image/png");                imagepng($this->image);            }else{                die("php不支持图片创建");            }        }        /**         * 析构函数         */        function __destruct(){            imagedestroy($this->$image);        }    }?>

源码下载：php教程学习笔记