PHP验证码类

<?php
header('Content-type:text/html;charset=utf8');
class Code{// 验证码个数$numberprotected $number;// 验证码类型$codeTypeprotected $codeType;// 验证码图像宽度$widthprotected $width;// 验证码$heightprotected $height;// 验证码字符串$codeprotected $code;// 图像资源$imageprotected $image;public function __construct($number=4,$codeType=0,$height=50,$width=100){//初始化自己的成员属性$this->number=$number;$this->codeType=$codeType;$this->width = $width;$this->height= $height;//生成验证码函数$this->code = $this ->createCode();}public function __get($name){if ($name == 'code'){return $this->code;}return false;}/*获取验证码*/public function getCode() {return $this->code;}/*图像资源销毁*/public function __destruct(){imagedestroy($this->image);}protected function createCode(){//通过你的验证码类型生成验证码switch ($this->codeType){case 0: //纯数字$code = $this->getNumberCode();break;case 1: //纯字母的$code = $this->getCharCode();break;case 2: //数字和字母混合$code = $this->getNumCharCode();break;default:die('不支持此类验证码类型');}return $code;}protected function getNumberCode(){$str = join('', range(0, 9));return substr(str_shuffle($str),0, $this->number);}protected function getCharCode(){$str = join('', range('a', 'z'));$str = $str.strtoupper($str);return substr(str_shuffle($str),0,$this->number);}protected function getNumCharCode(){$numstr = join('',range(0, 9));$str =join('', range('a', 'z'));$str =$numstr.$str.strtoupper($str);return substr(str_shuffle($str), 0,$this->number);}protected function createImage(){$this->image = imagecreatetruecolor($this->width, $this->height);}protected function fillBack(){imagefill($this->image, 0, 0, $this->lightColor());}/*浅色*/protected function lightColor(){return imagecolorallocate($this->image, mt_rand(133,255), mt_rand(133,255), mt_rand(133,255));}/*深色*/protected function darkColor(){return imagecolorallocate($this->image, mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));}protected function drawChar(){$width = ceil($this->width / $this->number);for ($i=0; $i< $this->number;$i++){$x = mt_rand($i*$width+5, ($i+1)*$width-10);$y = mt_rand(0, $this->height -15);imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor());}}protected function drawLine(){for ($i=0;$i<5;$i++) {imageline($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$this->darkColor());}}protected function drawDisturb(){for ($i=0;$i<150;$i++){$x=mt_rand(0, $this->width);$y=mt_rand(0, $this->height);imagesetpixel($this->image, $x, $y, $this->lightColor());}}protected function show(){header('Content-Type:image/png');imagepng($this->image);}public function outImage(){
//     创建画布$this->createImage();
//     填充背景色$this->fillBack();
//     将验证码字符串花到画布上$this->drawChar();
//     添加干扰元素// $this->drawDisturb();
//     添加线条// $this->drawLine();
//     输出并显示$this->show();}
}

应用

session_start();
$code= new Code(4,1,30,80);
$_SESSION['code']= $code->getCode();
$code->outImage();