验证码

Vivian_shuang

于 2016-08-19 08:37:44 发布

阅读量335

点赞数

CC 4.0 BY-SA版权

分类专栏： php 文章标签：验证码 php

本文链接：https://blog.youkuaiyun.com/Vivian_shuang/article/details/52247303

php 专栏收录该内容

27 篇文章

订阅专栏

yanzhengma.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="yan.php" method="post">
    <input type="text" placeholder="输入验证码" name="code">
    <img src="yanzheng.php" alt="">
    <a href="javascript:reloadImage()">看不清?点我点我点我</a>
    <input type="submit" value="提交">
</form>
<script>
    function reloadImage() {
        var img = document.getElementsByTagName("img")[0];
        img.src = "yanzheng.php";
    }
</script>
</body>
</html>

yanzheng.php

<?php
/**
 * Created by PhpStorm.
 * User: dllo
 * Date: 16/8/12
 * Time: 下午5:01
 */
header("Content-type:image/png");

session_start();
// 先删除原来session里的内容
//session_destroy();
unset($_SESSION["code"]);
$image = imagecreate(80,40);

imagecolorallocate($image,213,241,253);
$str = [];
for ($i = 0;$i < 6;$i++){
    switch (rand(0,2)){
        case 0:
            // 数字
            $str[$i] = chr(rand(48,57));
            break;
        case 1:
            // 大写字母
            $str[$i] = chr(rand(65,90));
            break;
        case 2:
            // 小写字母
            $str[$i] = chr(rand(97,122));
            break;
    }
    $randColor = imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
    imagechar($image,5,80 / 7 * ($i+1),10,$str[$i],$randColor);
}
$code = implode("",$str);
$_SESSION["code"] = $code;

//输入png格式的头像
imagepng($image);



yan.php
<?php
/**
 * Created by PhpStorm.
 * User: dllo
 * Date: 16/8/12
 * Time: 下午5:47
 */


header("Content-type:text/html;charset=utf-8");
session_start();
$_code = $_POST["code"];
if (strtoupper($_code) == strtoupper($_SESSION["code"])){
    echo "验证成功";
}else{
    echo "验证失败";
}