前端代码:
<?php session_start(); ?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>This is a test!</title>
</head>
<body>
<form method="post" name="form">
<input type="text" placeholder="账号"/><br/>
<input type="password" placeholder="密码"/><br/>
<input type="text" placeholder="验证码" name="yzm"/>
<img id="verImg" src="ceshi2.php"/>
<a href="#" class="change" onclick="changeVer()">点击刷新</a><br/>
<input type="submit" name="denglu" value="登录"/>
</form>
<script type="text/javascript">
//刷新验证码
function changeVer(){
document.getElementById("verImg").src="ceshi2.php?tmp="+Math.random();
}
</script>
<?php
//验证码的值保存在 验证码 $_SESSION["VerifyCode"]
if(@$_POST[denglu]){
if(@$_POST[yzm]==""){
echo "请输入验证码";
}
else{
if(@strtolower($_POST[yzm])==@strtolower($_SESSION["VerifyCode"])){
//strtolower()将函数转换成小写 实现不区分大小写
echo "验证码输入正确";
}
else{
echo "验证码输入错误";
}
}
}
?>
</body>
</html>
php脚本文件验证码的代码如下[ceshi2.php]:
<?php
session_start();
//开启session记录验证码数据
vCode(4, 15);//设置验证码的字符个数和图片基础宽度
//vCode 字符数目，字体大小，图片宽度、高度
function vCode($num = 4, $size = 20, $width = 0, $height = 0) {
!$width && $width = $num * $size * 4 / 5 + 15;
!$height && $height = $size + 10;
//设置验证码字符集合
$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW";
//保存获取的验证码
$code = '';
//随机选取字符
for ($i = 0; $i < $num; $i++) {
$code .= $str[mt_rand(0, strlen($str)-1)];
}
//创建验证码画布
$im = imagecreatetruecolor($width, $height);
//背景色
$back_color = imagecolorallocate($im, mt_rand(0,100),mt_rand(0,100), mt_rand(0,100));
//文本色
$text_color = imagecolorallocate($im, mt_rand(100, 255), mt_rand(100, 255), mt_rand(100, 255));
imagefilledrectangle($im, 0, 0, $width, $height, $back_color);
// 画干扰线
for($i = 0;$i < 5;$i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagearc($im, mt_rand(- $width, $width), mt_rand(- $height, $height), mt_rand(30, $width * 2), mt_rand(20, $height * 2), mt_rand(0, 360), mt_rand(0, 360), $font_color);
}
// 画干扰点
for($i = 0;$i < 50;$i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $font_color);
}
//随机旋转角度数组
$array=array(5,4,3,2,1,0,-1,-2,-3,-4,-5);
// 输出验证码
// imagefttext(image, size, angle, x, y, color, fontfile, text)
@imagefttext($im, $size , array_rand($array), 12, $size + 6, $text_color, 'c:\WINDOWS\Fonts\simsun.ttc', $code);
$_SESSION["VerifyCode"]=$code;
//no-cache在每次请求时都会访问服务器
//max-age在请求1s后再次请求会再次访问服务器，must-revalidate则第一发送请求会访问服务器，之后不会再访问服务器
// header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header("Cache-Control: no-cache");
header("Content-type: image/png;charset=gb2312");
//将图片转化为png格式
imagepng($im);
imagedestroy($im);
}
?>
Bài viết này đến từ http://www.chieng.cn, được sao chép, vui lòng ghi rõ!
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