分享一个漂亮的类,一起学习探讨。
验证码核心 类代码:
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//验证码类
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class ValidateCode {
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private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
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private $code;//验证码
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private $codelen = 4;//验证码长度
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private $width = 130;//宽度
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private $height = 50;//高度
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private $img;//图形资源句柄
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private $font;//指定的字体
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private $fontsize = 20;//指定字体大小
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private $fontcolor;//指定字体颜色
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//构造方法初始化
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public function __construct() {
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$this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字体路径要写对,否则显示不了图片
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}
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//生成随机码
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private function createCode() {
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$_len = strlen($this->charset)-1;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->code .= $this->charset[mt_rand(0,$_len)];
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}
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}
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//生成背景
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private function createBg() {
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$this->img = imagecreatetruecolor($this->width, $this->height);
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$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
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imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
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}
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//生成文字
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private function createFont() {
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$_x = $this->width / $this->codelen;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
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}
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}
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//生成线条、雪花
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private function createLine() {
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//线条
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for ($i=0;$i<6;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
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}
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//雪花
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for ($i=0;$i<100;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
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imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
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}
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}
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//输出
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private function outPut() {
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header('Content-type:image/png');
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imagepng($this->img);
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imagedestroy($this->img);
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}
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//对外生成
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public function doimg() {
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$this->createBg();
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$this->createCode();
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$this->createLine();
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$this->createFont();
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$this->outPut();
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}
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//获取验证码
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public function getCode() {
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return strtolower($this->code);
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}
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}
输出实例:
使用方法:
1、先把验证码类保存为一个名为 ValidateCode.class.php 的文件;
2、新建一个名为 captcha.php 的文件进行调用该类;
captcha.php
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session_start();
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require './ValidateCode.class.php'; //先把类包含进来,实际路径根据实际情况进行修改。
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$_vc = new ValidateCode(); //实例化一个对象
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$_vc->doimg();
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$_SESSION['authnum_session'] = $_vc->getCode();//验证码保存到SESSION中
3、引用到页面中,代码如下:
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<img title="点击刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
4、完整的验证页面:
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<?php
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session_start();
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//在页首先要开启session,
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//error_reporting(2047);
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session_destroy();
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//将session去掉,以每次都能取新的session值;
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//用seesion 效果不错,也很方便
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?>
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<html>
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<head>
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<title>session 图片验证实例_</title>
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<style type="text/css">
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#login p{
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margin-top: 15px;
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line-height: 20px;
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font-size: 14px;
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font-weight: bold;
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}
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#login img{
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cursor:pointer;
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}
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form{
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margin-left:20px;
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}
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</style>
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</head>
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<body>
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<form id="login" action="" method="post">
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<p>此例为session验证实例</p>
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<p>
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<span>验证码:</span>
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<input type="text" name="validate" value="" size=10>
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<img title="点击刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
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</p>
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<p>
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<input type="submit">
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</p>
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</form>
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<?php
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//打印上一个session;
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//echo "上一个session:".$_SESSION["authnum_session"]."
";
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$validate="";
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if(isset($_POST["validate"])){
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$validate=$_POST["validate"];
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echo "您刚才输入的是:".$_POST["validate"]."
状态:";
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if($$_SESSION["authnum_session"]){
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//判断session值与用户输入的验证码是否一致;
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echo "输入有误";
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}else{ //
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echo "通过验证";
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}
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}
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?>
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