正文

PHP雪花背景验证码

IP云
IP云V管理员/4 阅读
12/01
提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示
more
ValidateCode.class.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
<?php
/**
* 验证码类
* @author staven
*
*/
class ValidateCode{
private $width ; //验证码图片的宽度
private $height ; //验证码图片的高度
private $checkCode ; //验证码字符
private $codeNum ; //验证码字符个数
private $font ; //字体
private $fontSize ; //字体大小
private $fontColor ; //字体颜色
private $image ; //验证码句柄
private $charset ; //验证字符随机因子
//构造器方法初始化
function __construct( $width =100, $height =20, $codeNum =4, $fontSize = 12){
$this ->width = $width ;
$this ->height = $height ;
$this ->codeNum = $codeNum ;
$this ->fontSize = $fontSize ;
$this ->font = dirname( __FILE__ ) . '/font/elephant.ttf' ;
$this ->charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789' ; //提供随机因子
$this ->checkCode = $this ->createCheckCode();
}
/* 用于输出验证码图片，并且将验证码信息写入session */
function __toString(){
/* 加到session中， 存储下标为code */
$_SESSION [ "code" ] = strtoupper ( $this ->checkCode);
$this ->outImage();
return '' ;
}
/* 生成随机验证码字符 */
private function createCheckCode(){
for ( $i =0; $i < $this ->codeNum; $i ++){
$this ->checkCode .= $this ->charset{mt_rand(0, strlen ( $this ->charset)-1)};
}
return $this ->checkCode;
}
/* 输出验证码 */
private function outImage(){
$this ->getCreateImage();
$this ->createLine();
$this ->outputText();
$this ->outputImage();
}
/* 生成验证码背景图片 */
private function getCreateImage(){
$this ->image = imagecreatetruecolor( $this ->width, $this ->height);
$color = imagecolorallocate( $this ->image, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
imagefilledrectangle( $this ->image,0, $this ->height, $this ->width,0, $color );
}
/* 向句柄图片中写入文字信息 */
private function outputText(){
$_x = $this ->width / $this ->codeNum;
for ( $i =0; $i < $this ->codeNum; $i ++) {
$this ->fontcolor = imagecolorallocate( $this ->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imagettftext( $this ->image, $this ->fontSize,mt_rand(-30,30), $_x * $i +mt_rand(1,5), $this ->height / 1.4, $this ->fontColor, $this ->font, $this ->checkCode[ $i ]);
}
}
/*  创建雪花图案 */
private function createLine() {
for ( $i =0; $i <6; $i ++) {
$color = imagecolorallocate( $this ->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imageline( $this ->image,mt_rand(0, $this ->width),mt_rand(0, $this ->height),mt_rand(0, $this ->width),mt_rand(0, $this ->height), $color );
}
for ( $i =0; $i <100; $i ++) {
$color = imagecolorallocate( $this ->image,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
imagestring( $this ->image,mt_rand(1,5),mt_rand(0, $this ->width),mt_rand(0, $this ->height), '*' , $color );
}
}
/* 生成验证码图片 */
private function outputImage(){
header( 'Content-type:image/png' );
imagepng( $this ->image);
}
/* 销毁句柄，释放资源 */
function __destruct() {
imagedestroy( $this ->image);
}
}

imageCode.php

1
2
3
4
<?php
session_start(); //开启SESSION
require_once 'ValidateCode.class.php' ;
echo new ValidateCode();

image.php

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
<!DOCTYPE html>
<html>
<head>
<meta charset= "gbk" >
<title>验证码</title>
</head>
<body>
<img src= "imagecode.php" alt= "看不清楚，换一张" style= "cursor: pointer;" onclick= "this.src='imagecode.php?'+new Date().getTime();" />
<form method= "POST" action= "image.php" >
<input type= "text" size= "4" name= "code" />
<input type= "submit" name= "submit" value= "提交" >
</form>
</body>
</html>
<?php
/** 用于 */
session_start(); //开启SESSION
if (isset( $_POST [ 'submit' ])){ //判断用户提交后执行
/* 判断用户在表单中输入的字符串和验证码图片中的字符串是否相同  */
if ( strtoupper (trim( $_POST [ "code" ])) == $_SESSION [ 'code' ]){ //如果验证码输出成功
echo '验证码输入成功<br>' ; //输出成功的提示信息
} else { //如果验证码输入失败
echo '<font color="red">验证码输入错误！！</font><br>' ; //输出失败的输入信息
}
}
?>
来自为知笔记(Wiz)

相关阅读

目录[+]