<?php class ValidationCode { //属性 private $width; private $height; private $codeNum; private $image; private $disturbColorNum; //干扰元素数目 private $checkCode; function __construct($width=80,$height=20,$codeNum=4) { $this->width=$width; $this->height=$height; $this->codeNum=$codeNum; $number=floor($width*$height/15); if($number>240-$codeNum) { $this->disturbColorNum=240-$codeNum; }else { $this->disturbColorNum=$number; } $this->checkCode=$this->createCheckcode(); } function getCheckCode() { return $this->checkCode; } private function createImage(){ $this->image=imagecreatetruecolor($this->width,$this->height); $backcolor=imagecolorallocate($this->image,rand(225,255),rand(225,255),rand(255,255)); imagefill($this->image,0,0,$backcolor); $border=imagecolorallocate($this->image,0,0,0); imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border); } private function setDisturbColor(){ for($i=0;$i<$this->disturbColorNum;$i++){ $color=imagecolorallocate($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++) { $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); imagearc($this->image,rand(-10,$this->width),rand(-10,$this->height),rand(30,300),rand(20,300),55,44,$color); } } private function outputText($fontFace=""){ for($i=0;$i<$this->codeNum;$i++) { $fontcolor=imagecolorallocate($this->image,rand(0,128),rand(0,128),rand(0,128)); if($fontFace==""){ $fontsize=rand(3,5); $x=floor($this->width/$this->codeNum)*$i+5; $y=rand(0,$this->height-15); imagechar($this->image,$fontsize,$x,$y,$this->checkCode{$i},$fontcolor); } else{ $fontsize=rand(12,16); $x=floor(($this->width-8)/$this->codeNum)*$i+8; $y=rand($fontsize,$this->height-8); imagettftext($this->image,$fontsize,rand(-45,45),$x,$y,$fontcolor,$fontFace,$this->checkCode{$i}); } } } private function createCheckCode(){ $code="23456789abcdefghijkmnpqrstuvwrst"; $str=""; for($i=0;$i<$this->codeNum;$i++) { $char=$code{rand(0,strlen($code)-1)}; $str.=$char; } return $str; } private function outputImage() { if(imagetypes()&IMG_GIF) { header("Content-Type:image/gif"); imagepng($this->image); }else if(imagetypes()&IMG_JPG) { header("Content-Type:image/jpeg"); imagepng($this->image); }else if(imagetypes()&IMG_PNG) { header("Content-Type:image/png"); imagepng($this->image); }else if(imagetypes()&IMG_WBMP){ header("Content-Type:image/vnd.wap.wbmp"); imagepng($this->image); }else { die("PHP不支持图片验证码"); } } //通过该方法向浏览器输出图像 function showImage($fontFace="") { //创建图像背景 $this->createImage(); //设置干扰元素 $this->setDisturbColor(); //向图像中随机画出文本 $this->outputText($fontFace); //输出图像 $this->outputImage(); } function __destruct() { imagedestroy($this->image); } } function checklogin(){ if(empty($_POST['name'])) die( '用户名不能为空'); if(empty($_POST['password'])) die("密码不能为空"); if($_SESSION['code']!=$_POST['vertify']) die("验证码输入不正确".$_SESSION['code']); $username=$_POST['name']; $password=md5($_POST['password']); //检查是否存在 conndb($username,$password); } function conndb($name="",$ps=""){ $conn=mysql_connect('localhost','root','123456'); if(!$conn) die("数据库连接失败".mysql_error()); mysql_select_db('5kan',$conn) or die('选择数据库失败'.mysql_error());mysql_set_charset('utf8',$conn);$sql="select id from k_user where username='{$name}' and password='{$ps}'";$result=mysql_query($sql) or die("SQL语句错误".mysql_error());if(mysql_num_rows($result)>0) die("登录成功");else die("用户名或者密码错误");mysql_close($conn); } session_start(); if(!isset($_POST['randnum'])) { $code=new ValidationCode(120,20,4); $code->showImage("comicbd.ttf"); //显示在页面 $_SESSION['code']=$code->getCheckCode();//保存在服务器中 } else { checklogin(); }?>
