PHP验证码类实现
<?php
class verify{
//宽
protected $width;
//高
protected $height;
//图片资源
protected $img;
//图片类型
protected $imgType;
//文字类型
protected $type;
//文字
protected $checkCode;
//文字个数
protected $num;
//构造方法，初使化各个成员属性包括根据文字类型，产生文字
public function __construct($width=120,$height=40,$imgType='jpeg',$type=3,$num=4){
$this->width=$width;
$this->height=$height;
$this->imgType=$imgType;
$this->num=$num;
$this->type=$type;
$this->checkCode=$this->getCheckCode();
}
//产生文字得分为1,2,3 1为数字 2为字母 3为字母数字混合
private function getCheckCode(){
//定义一个空字符串，向他赋值，并且得到值后，待会返回这个字符串的值，这样即得到验证码
$string='';
//判断type
switch($this->type){
case 1:
$string=join('',array_rand(range(0,9),$this->num));
break;
case 2:
$string=implode('',array_rand(array_flip(range('a','z')),$this->num));
break;
case 3:
/*
for($i=0;$i<$this->num;$i++){
$r=mt_rand(0,2);
switch($r){
//0-9
case 0:
$char=mt_rand(48,57);
break;
//A-Z
case 1:
$char=mt_rand(65,90);
break;
//a-z
case 2:
$char=mt_rand(97,122);
break;
}
//chr
//$string.=sprintf('%c',$char);
$string.=chr($char);
}*/
$str='abcdefghijkmnprstuvwxyz23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
$string=substr(str_shuffle($str),0,$this->num);
break;
}
return $string;
}
//创建图片
protected function createImg(){
$this->img=imagecreatetruecolor($this->width,$this->height);
}
//
//产生背景颜色,颜色值越大，越浅，越小越深
protected function bgColor(){
return imagecolorallocate($this->img,mt_rand(130,255),mt_rand(130,255),mt_rand(130,255));
}
//字的颜色
protected function fontColor(){
return imagecolorallocate($this->img,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120));
}
//填充背景颜色
protected function filledColor(){
imagefilledrectangle($this->img,0,0,$this->width,$this->height,$this->bgColor());
}
//画上干扰点
protected function pix(){
for($i=0;$i<50;$i++){
imagesetpixel($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),$this->fontColor());
}
}
//画上干扰线
protected function arc(){
for($i=0;$i<5;$i++){
imagearc($this->img,mt_rand(10,$this->width-10),mt_rand(10,$this->height-10),200,50,mt_rand(0,90),mt_rand(100,350),$this->fontColor());
}
}
//写字，得到x,y
//
//ceil 进一法取整
//
//floor舍法取整
//
protected function write(){
for($i=0;$i<$this->num;$i++){
$x=ceil($this->width/$this->num)*$i;
$y=mt_rand(0,$this->height-15);
imagechar($this->img,5,$x,$y,$this->checkCode[$i],$this->fontColor());
}
}
//输出
protected function output(){
$func='image'.$this->imgType;
$header='Content-type:image/'.$this->imgType;
if(function_exists($func)){
header($header);
$func($this->img);
}else{
echo '不支持该图片类型';
exit;
}
}
//组装得到图片
public function getImage(){
$this->createImg();
$this->filledColor();
$this->pix();
$this->arc();
$this->write();
$this->output();
}
//写个魔术方法，专门给外部得到验证码字符串使用
public function __get($className){
if($className=='checkCode'){
return $this->checkCode;
}
}
//销毁
public function __destruct(){
imagedestroy($this->img);
}
}
?>
页:
[1]