code.PHP是验证码类，类的名称最好和文件名的名称一样，这样有利于我们的查看。
code.PHP
//初始化自己的成员属性
$this->number=$number;
$this->codeType=$codeType;
$this->width = $width;
$this->height= $height;
//<a href="https://www.jb51.cc/tag/shengcheng/" target="_blank" class="keywords">生成</a>验证码<a href="https://www.jb51.cc/tag/hanshu/" target="_blank" class="keywords">函数</a>
$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),$this->number);
}
protected function getCharCode(){
$str = join('',range('a','z'));
$str = $str.strtoupper($str);
return substr(str_shuffle($str),$this->number);
}
protected function getNumCharCode(){
$numstr = join('',9));
$str =join('','z'));
$str =$numstr.$str.strtoupper($str);
return substr(str_shuffle($str),$this->number);
}
protected function createImage(){
$this->image = imagecreatetruecolor($this->width,$this->height);
}
protected function fillBack(){
imagefill($this->image,$this->lightColor());
}
/浅色/
protected function lightColor(){
return imagecolorallocate($this->image,mt_rand(133,255),255));
}
/深色/
protected function darkColor(){
return imagecolorallocate($this->image,mt_rand(0,120),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,$this->width),$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($this->image,$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();
}
}
test.PHP是new一个新的验证码，并把它保存到session中，为我们验证码的验证起到保存和存储的作用。
test.PHP
$_SESSION['code']= $code->getCode();
$code->outImage();
login.PHP就是最后的验证。
login.PHP