个人写的PHP验证码生成类分享
此验证码类直接拿去就可以用，也可以参考！
其中类成员codestr是生成的验证码字符串:
<?php
/**
*验证码
*/
classCode{
//1.定义各个成员有宽、高、画布、字数、类型、画类型
private$width;//宽度
private$height;//高度
private$num;//验证码字数
private$imgType;//生成图片类型
private$Type;//字串类型1,2,3三个选项1纯数字2纯小写字母3大小写数字混合
private$hb;//画布
public$codestr;//验证码字串
publicfunction__construct($height=20,$num=4,$imgType="jpeg",$Type=1){
$this->width=$num*20;
$this->height=$height;
$this->num=$num;
$this->imgType=$imgType;
$this->Type=$Type;
$this->codestr=$this->codestr();
$this->zuhe();
}
//2.定义随机获取字符串函数
privatefunctioncodestr(){
switch($this->Type){
case1://类型为1获取1-9随机数
$str=implode("",array_rand(range(0,9),$this->num));
break;
case2://类型为2获取a-z随机小写字母
$str=implode("",array_rand(array_flip(range(a,z)),$this->num));
break;
case3://类型为3获取数字,小写字母,大写字母混合
for($i=0;$i<$this->num;$i++){
$m=rand(0,2);
switch($m){
case0:
$o=rand(48,57);
break;
case1:
$o=rand(65,90);
break;
case2:
$o=rand(97,122);
break;
}
$str.=sprintf("%c",$o);
}
break;
}
return$str;
}
//3.初始化画布图像资源
privatefunctionHb(){
$this->hb=imagecreatetruecolor($this->width,$this->height);
}
//4.生成背景颜色
privatefunctionBg(){
returnimagecolorallocate($this->hb,rand(130,250),rand(130,250),rand(130,250));
}
//5.生成字体颜色
privatefunctionFont(){
returnimagecolorallocate($this->hb,rand(0,100),rand(0,100),rand(0,100));
}
//6.填充背景颜色
privatefunctionBgColor(){
imagefilledrectangle($this->hb,0,0,$this->width,$this->height,$this->Bg());
}
//7.干扰点
privatefunctionganrao(){
$sum=floor(($this->width)*($this->height)/3);
for($i=0;$i<$sum;$i++){
imagesetpixel($this->hb,rand(0,$this->width),rand(0,$this->height),$this->Bg());
}
}
//8.随机直线弧线
privatefunctionhuxian(){
for($i=0;$i<$this->num;$i++){
imageArc($this->hb,rand(0,$this->width),rand(0,$this->height),rand(0,$this->width),rand(0,$this->height),rand(0,360),rand(0,360),$this->Bg());
}
}
//9.写字
privatefunctionxiezi(){
for($i=0;$i<$this->num;$i++){
$x=ceil($this->width/$this->num)*$i;
$y=rand(1,$this->height-15);
imagechar($this->hb,5,$x+4,$y,$this->codestr[$i],$this->Font());
}
}
//10.输出
privatefunctionOutImg(){
$shuchu="image".$this->imgType;
$header="Content-type:image/".$this->imgType;
if(function_exists($shuchu)){
header($header);
$shuchu($this->hb);
}else{
exit("GD库没有此类图像");
}
}
//11.拼装
privatefunctionzuhe(){
$this->Hb();
$this->BgColor();
$this->ganrao();
$this->huxian();
$this->xiezi();
$this->OutImg();
}
publicfunctiongetCodeStr(){
return$this->codestr;
}
}
?>