PHP雪花背景验证码
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ValidateCode.class.php
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<?php /** * 验证码类 * @author staven * */ class ValidateCode{ private $width; //验证码图片的宽度 private $height; //验证码图片的高度 private $checkCode; //验证码字符 private $codeNum; //验证码字符个数 private $font; //字体 private $fontSize; //字体大小 private $fontColor; //字体颜色 private $image; //验证码句柄 private $charset; //验证字符随机因子 //构造器方法初始化 function __construct($width=100, $height=20, $codeNum=4,$fontSize = 12){ $this->width = $width; $this->height = $height; $this->codeNum = $codeNum; $this->fontSize = $fontSize; $this->font = dirname(__FILE__) . ‘/font/elephant.ttf‘; $this->charset = ‘abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789‘; //提供随机因子 $this->checkCode = $this->createCheckCode(); } /* 用于输出验证码图片，并且将验证码信息写入session */ function __toString(){ /* 加到session中， 存储下标为code */ $_SESSION["code"] = strtoupper($this->checkCode); $this->outImage(); return ‘‘; } /* 生成随机验证码字符 */ private function createCheckCode(){ for ($i=0; $i<$this->codeNum; $i++){ $this->checkCode .= $this->charset{mt_rand(0,strlen($this->charset)-1)}; } return $this->checkCode; } /* 输出验证码 */ private function outImage(){ $this->getCreateImage(); $this->createLine(); $this->outputText(); $this->outputImage(); } /* 生成验证码背景图片 */ private function getCreateImage(){ $this->image = imagecreatetruecolor($this->width,$this->height); $color = imagecolorallocate($this->image, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255)); imagefilledrectangle($this->image,0,$this->height,$this->width,0,$color); } /* 向句柄图片中写入文字信息 */ private function outputText(){ $_x = $this->width / $this->codeNum; for ($i=0;$i<$this->codeNum;$i++) { $this->fontcolor = imagecolorallocate($this->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imagettftext($this->image,$this->fontSize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontColor,$this->font,$this->checkCode[$i]); } } /* 创建雪花图案 */ private function createLine() { for ($i=0;$i<6;$i++) { $color = imagecolorallocate($this->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imageline($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); } for ($i=0;$i<100;$i++) { $color = imagecolorallocate($this->image,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)); imagestring($this->image,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),‘*‘,$color); } } /* 生成验证码图片 */ private function outputImage(){ header(‘Content-type:image/png‘); imagepng($this->image); } /* 销毁句柄，释放资源 */ function __destruct() { imagedestroy($this->image); } } |
imageCode.php
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<?php session_start(); //开启SESSION require_once ‘ValidateCode.class.php‘; echo new ValidateCode(); |
image.php
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<!DOCTYPE html><html><head> <meta charset="gbk"> <title>验证码</title></head><body> <img src="imagecode.php" alt="看不清楚，换一张" style="cursor: pointer;" onclick="this.src=‘imagecode.php?‘+new Date().getTime();" /> <form method="POST" action="image.php"> <input type="text" size="4" name="code" /> <input type="submit" name="submit" value="提交"> </form></body></html><?php /** 用于 */ session_start(); //开启SESSION if(isset($_POST[‘submit‘])){ //判断用户提交后执行 /* 判断用户在表单中输入的字符串和验证码图片中的字符串是否相同 */ if(strtoupper(trim($_POST["code"])) == $_SESSION[‘code‘]){ //如果验证码输出成功 echo ‘验证码输入成功<br>‘; //输出成功的提示信息 }else{ //如果验证码输入失败 echo ‘<font color="red">验证码输入错误！！</font><br>‘; //输出失败的输入信息 } }?> |
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