<?php
//验证码类
class ValidateCode {
private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; //随机因子
private $code; //验证码
private $codelen = 4; //验证码长度
private $width = 130; //宽度
private $height = 50; //高度
private $img; //图形资源句柄
private $font; //指定的字体
private $fontsize = 20; //指定字体大小
private $fontcolor; //指定字体颜色
//构造方法初始化
public function __construct() {
$this->font = ROOT_PATH.'/font/elephant.ttf';
}
//生成随机码
private function createCode() {
$_len = strlen($this->charset)-1;
for ($i=0;$i<$this->codelen;$i++) {
$this->code .= $this->charset[mt_rand(0,$_len)];
}
}
//生成背景
private function createBg() {
$this->img = imagecreatetruecolor($this->width, $this->height);
$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
}
//生成文字
private function createFont() {
$_x = $this->width / $this->codelen;
for ($i=0;$i<$this->codelen;$i++) {
$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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[$i]);
}
}
//生成线条、雪花
private function createLine() {
for ($i=0;$i<6;$i++) {
$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imageline($this->img,mt_rand(0,$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->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
}
}
//输出
private function outPut() {
header('Content-type:image/png');
imagepng($this->img);
imagedestroy($this->img);
}
//对外生成
public function doimg() {
$this->createBg();
$this->createCode();
$this->createLine();
$this->createFont();
$this->outPut();
}
//获取验证码
public function getCode() {
return strtolower($this->code);
}
}
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、做一个名为 code.php 的文件进行调用该类；
code.php
<?php
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。
$_vc = new ValidateCode(); //实例化一个对象
$_vc->doimg();
$_SESSION['code'] = $_vc->getCode();//验证码保存到SESSION中
?>
3、引用到页面中，代码如下：
</pre><pre class="html" name="code"><label><img src="./code.php" οnclick="javascript:this.src='./code.php?tm='+Math.random();" /></label>
下载地址：http://pan.baidu.com/s/1bngYmM7
