<?php
class
Vcode {
private
$width
;
//宽
private
$height
;
//高
private
$num
;
//数量
private
$code
;
//验证码
private
$img
;
//图像的资源
//构造方法， 三个参数
function
__construct(
$width
=80,
$height
=20,
$num
=4) {
$this
->width =
$width
;
$this
->height =
$height
;
$this
->num =
$num
;
$this
->code =
$this
->createcode();
//调用自己的方法
}
//获取字符的验证码， 用于保存在服务器中
function
getcode() {
return
$this
->code;
}
//输出图像
function
outimg() {
//创建背景 (颜色， 大小， 边框)
$this
->createback();
//画字 (大小， 字体颜色)
$this
->outstring();
//干扰元素(点， 线条)
$this
->setdisturbcolor();
//输出图像
$this
->printimg();
}
//创建背景
private
function
createback() {
//创建资源
$this
->img = imagecreatetruecolor(
$this
->width,
$this
->height);
//设置随机的背景颜色
$bgcolor
= imagecolorallocate(
$this
->img, rand(225, 255), rand(225, 255), rand(225, 255));
//设置背景填充
imagefill(
$this
->img, 0, 0,
$bgcolor
);
//画边框
$bordercolor
= imagecolorallocate(
$this
->img, 0, 0, 0);
imagerectangle(
$this
->img, 0, 0,
$this
->width-1,
$this
->height-1,
$bordercolor
);
}
//画字
private
function
outstring() {
for
(
$i
=0;
$i
<
$this
->num;
$i
++) {
$color
= imagecolorallocate(
$this
->img, rand(0, 128), rand(0, 128), rand(0, 128));
$fontsize
=rand(3,5);
//字体大小
$x
= 3+(
$this
->width/
$this
->num)*
$i
;
//水平位置
$y
= rand(0, imagefontheight(
$fontsize
)-3);
//画出每个字符
imagechar(
$this
->img,
$fontsize
,
$x
,
$y
,
$this
->code{
$i
},
$color
);
}
}
//设置干扰元素
private
function
setdisturbcolor() {
//加上点数
for
(
$i
=0;
$i
<100;
$i
++) {
$color
= imagecolorallocate(
$this
->img, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel(
$this
->img, rand(1,
$this
->width-2), rand(1,
$this
->height-2),
$color
);
}
//加线条
for
(
$i
=0;
$i
<10;
$i
++) {
$color
= imagecolorallocate(
$this
->img, rand(0, 255), rand(0, 128), rand(0, 255));
imagearc(
$this
->img,rand(-10,
$this
->width+10), rand(-10,
$this
->height+10), rand(30, 300), rand(30, 300), 55,44,
$color
);
}
}
//输出图像
private
function
printimg() {
if
(imagetypes() & IMG_GIF) {
header(
"Content-type: image/gif"
);
imagegif(
$this
->img);
}
elseif
(function_exists(
"imagejpeg"
)) {
header(
"Content-type: image/jpeg"
);
imagegif(
$this
->img);
}
elseif
(imagetypes() & IMG_PNG) {
header(
"Content-type: image/png"
);
imagegif(
$this
->img);
}
else
{
die
(
"No image support in this PHP server"
);
}
}
//生成验证码字符串
private
function
createcode() {
$codes
=
"3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY"
;
$code
=
""
;
for
(
$i
=0;
$i
<
$this
->num;
$i
++) {
$code
.=
$codes
{rand(0,
strlen
(
$codes
)-1)};
}
return
$code
;
}
//用于自动销毁图像资源
function
__destruct() {
imagedestroy(
$this
->img);
}
}
<?php
//开启session
session_start();
include
"vcode.class.php"
;
//构造方法
$vcode
=
new
Vcode(80, 30, 4);
//将验证码放到服务器自己的空间保存一份
$_SESSION
[
'code'
] =
$vcode
->getcode();
//将验证码图片输出
$vcode
->outimg();
?>
<?php
session_start();
if
(isset(
$_POST
[
'dosubmit'
])) {
if
(
strtoupper
(
$_SESSION
[
'code'
]) ==
strtoupper
(
$_POST
[
'code'
]) ) {
echo
"输入成功!<br>"
;
}
else
{
echo
"输入不对!<br>"
;
}
}
?>
<body>
<form action=
"reg.php"
method=
"post"
>
username: <input type=
"text"
name=
"username"
> <br>
password: <input type=
"password"
name=
"password"
> <br>
code: <input type=
"text"
onkeyup=
"if(this.value!=this.value.toUpperCase()) this.value=this.value.toUpperCase()"
size=
"6"
name=
"code"
>
<img src=
"code.php"
onclick=
"this.src='code.php?'+Math.random()"
/> <br>
<input type=
"submit"
name=
"dosubmit"
value=
"登 录"
> <br>
</form>
</body>
压缩包在文件中