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  2. 验证码总结

验证码总结

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-14 01:14:19

1.验证码封装

<?php

/**
 * 验证码封装
 * @param int $type   类型1数字 2字母 3数字或字母
 * @param int $leng   长度
 * @param int $pixel  干扰点
 * @param int $line   干扰线段
 * @param int $arc    干扰圆弧
 * @param int $snow   干扰雪花
 * @param int $width   宽
 * @param int $height  高
 */
function createVerCode($type = 1, $leng = 4, $pixel = 0, $line = 0, $arc = 0, $snow = 0, $width = 100, $height = 20)
{
    //创建画布
    $image = imagecreatetruecolor($width, $height);//创建画布，返回资源

    //创建颜色
    $white = imagecolorallocate($image, 255, 255, 255);

    //绘制填充矩形，用特定颜色填充画布
    imagefilledrectangle($image, 0, 0, $width, $height, $white);

    if ($leng <= 3)
        $leng = 3;
    if ($leng >= 6)
        $leng = 6;
    $verCodeString = '';
    //绘制复杂点的验证码
    for ($i = 0; $i < $leng; $i++) {
        $verCode = randChar($type);
        $verCodeString .= $verCode; //生成的验证码
        $x = 10 + ($width / $leng) * $i;
        $y = 0;
        imagechar($image, 10, $x, $y, $verCode, randColor($image));
    }

    //将验证码存入session
    session_start();
    $_SESSION['verCodeString'] = $verCodeString;

   //加随机点做干扰元素
    if ($pixel > 0) {
        for ($i = 1; $i <= $pixel; $i++) {
            imagesetpixel($image, mt_rand(0, $width), mt_rand(0, $height), randColor($image));
        }
    }

    //加线段做干扰元素
    if ($line > 0) {
        for ($i = 1; $i <= $line; $i++) {
            imageline($image, mt_rand(0, $width), mt_rand(0, $height), mt_rand(0, $width), mt_rand(0, $height), randColor($image));
        }
    }

    //加圆弧做干扰元素
    if ($arc > 0) {
        for ($i = 1; $i <= $arc; $i++) {
            imagearc($image, mt_rand(0, $width), mt_rand(0, $height), mt_rand(0, $width / 2), mt_rand(0, $height / 2), mt_rand(0, 360), mt_rand(0, 360), randColor($image));
        }
    }

    //加雪花做干扰元素
    if ($snow > 0) {
        for ($i = 1; $i <= $snow; $i++) {
            imagestring($image, mt_rand(0,5),mt_rand(0, $width), mt_rand(0, $height),'*',randColor($image));
        }
    }


//告诉浏览器以图片形式显示
    header('Content-type: image/png');//png

//输出图像
    imagepng($image);//png

//销毁资源
    imagedestroy($image);
}


/**
 * 返回随机颜色
 * 图片资源 $image
 * 颜色 int
 */
function randColor($image)
{
    return imagecolorallocate($image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
}

/**
 * 返回一个字符
 * @param int $type 1数字 2字母 3数字或字母
 * @return string
 */
function randChar($type = 1)
{
    if ($type == 1) {
        return str_shuffle(implode('', range(0, 9)))[0];
    }
    if ($type == 2) {
        return str_shuffle(implode('', array_merge(range('a', 'z'), range('A', "Z"))))[0];
    }
    if ($type == 3) {
        return str_shuffle(implode('', array_merge(range(0, 9), range('a', 'z'), range('A', "Z"))))[0];
    }
    return '';
}

createVerCode(1, 4, 0, 0,0,5);

2.验证码类

 

<?php
/**
 * 验证码类
 * Created by PhpStorm.
 * User: sxt
 * Date: 2019/12/13
 * Time: 11:12
 */
class verCode{
    private $type;
    private $leng;
    private $pixel;
    private $line;
    private $arc;
    private $snow;
    private $width;
    private $height;
    private $white;
    private $image = null;
    private $verCodeString = '';
    private $verCode = '';

    public function __construct($type = 1, $leng = 4, $pixel = 0, $line = 0, $arc = 0, $snow = 0, $width = 100, $height = 20)
    {
        $this->type = $type;
        $this->leng = $leng;
        $this->pixel = $pixel;
        $this->line = $line;
        $this->arc = $arc;
        $this->snow  = $snow ;
        $this->width = $width;
        $this->height = $height;
    }

   public function getVerCode()
    {
        //创建画布
        $this->image = imagecreatetruecolor($this->width, $this->height);//创建画布，返回资源

        //创建颜色
        $this->white = imagecolorallocate($this->image, 255, 255, 255);

        //绘制填充矩形，用特定颜色填充画布
        imagefilledrectangle($this->image, 0, 0, $this->width, $this->height, $this->white);

        if ($this->leng <= 3)
            $this->leng = 3;
        if ($this->leng >= 6)
            $this->leng = 6;
        //绘制复杂点的验证码
        for ($i = 0; $i < $this->leng; $i++) {
            $this->verCode = $this->randChar();
            $this->verCodeString .= $this->verCode; //生成的验证码
            imagechar($this->image, 10, 10 + ($this->width / $this->leng) * $i, 0, $this->verCode, $this->randColor());
        }

        //加随机点做干扰元素
        if ($this->pixel > 0) {
            $this->createPixel();
        }

        //加线段做干扰元素
        if ($this->line > 0) {
            $this->createLine();
        }

        //加圆弧做干扰元素
        if ($this->arc > 0) {
            $this->createArc();
        }

        //加雪花做干扰元素
        if ($this->snow > 0) {
            $this->createSnow();
        }

        header('Content-type: image/png');//png
        imagepng($this->image);//png
        imagedestroy($this->image);

        //return $this->verCodeString;
    }

    /**
     * 生成干扰点
     */
    private function createPixel(){
        for ($i = 1; $i <= $this->pixel; $i++) {
            imagesetpixel($this->image, mt_rand(0, $this->width), mt_rand(0, $this->height), $this->randColor());
        }
    }

    /**
     * 生成干扰直线
     */
    private function createLine(){
        for ($i = 1; $i <= $this->line; $i++) {
            imageline($this->image, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $this->randColor());
        }
    }

    /**
     * 生成干扰圆弧
     */
    private function createArc (){
        for ($i = 1; $i <= $this->arc; $i++) {
            imagearc($this->image, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width / 2), mt_rand(0, $this->height / 2), mt_rand(0, 360), mt_rand(0, 360), $this->randColor());
        }
    }

    /**
     * 生成干扰雪花
     */
    private function createSnow(){
        for ($i = 1; $i <= $this->snow; $i++) {
            imagestring($this->image, mt_rand(0,5),mt_rand(0, $this->width), mt_rand(0, $this->height),'*',$this->randColor());
        }
    }

    /**
     * 返回随机颜色
     */
    private function randColor()
    {
        return imagecolorallocate($this->image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
    }

    /**
     * 返回一个字符
     * @param int $type 1数字 2字母 3数字或字母
     * @return string
     */
    private function randChar()
    {
        if ($this->type == 1) {
            return str_shuffle(implode('', range(0, 9)))[0];
        }
        if ($this->type == 2) {
            return str_shuffle(implode('', array_merge(range('a', 'z'), range('A', "Z"))))[0];
        }
        if ($this->type == 3) {
            return str_shuffle(implode('', array_merge(range(0, 9), range('a', 'z'), range('A', "Z"))))[0];
        }
        return '';
    }
}

3.显示表单页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>验证码</title>
</head>
<body>
<form action="checkVerCode.php" method="post">
    <table>
    <tr>
        <td>用户名</td>
        <td><input type="text" name="name"></td>
    </tr>
    <tr>
        <td>密码</td>
        <td><input type="text" name="pass"></td>
    </tr>
    <tr>
        <td>验证码</td>
        <td><input type="text" name="vercode">
            <img src="verCodefun.php" id ='verCodefun'>
            <a href="#" οnclick="document.getElementById('verCodefun').src='verCodefun.php?r='+Math.random()">
                看不清，换一张
            </a>
        </td>
    </tr>
        <tr>
            <td>
                <input type="submit" value="提交">
            </td>
        </tr>
</table>
</form>

<!--图片验证码-->
<!--<form action="checkVerCode.php" method="post">-->
    <!--<table>-->
        <!--<tr>-->
            <!--<td>用户名</td>-->
            <!--<td><input type="text" name="name"></td>-->
        <!--</tr>-->
        <!--<tr>-->
            <!--<td>密码</td>-->
            <!--<td><input type="text" name="pass"></td>-->
        <!--</tr>-->
        <!--<tr>-->
            <!--<td>图片里的动物是</td>-->
            <!--<td><input type="text" name="vercode">-->
                <!--<img src="imageVerCode.php" id ='verCodefun' width="100" height="100">-->
                <!--<a href="#" οnclick="document.getElementById('verCodefun').src='imageVerCode.php?r='+Math.random()">-->
                    <!--看不清，换一张-->
                <!--</a>-->
            <!--</td>-->
        <!--</tr>-->
        <!--<tr>-->
            <!--<td>-->
                <!--<input type="submit" value="提交">-->
            <!--</td>-->
        <!--</tr>-->
    <!--</table>-->
<!--</form>-->


</body>
</html>

4.验证码检验

<?php

session_start();
//$verCodeString = $_SESSION['verCodeString'];//验证一般验证码
$verCodeString = $_SESSION['imageCode'];//验证图片验证码
if ($verCodeString != $_POST['vercode']) {
    exit('验证码错误');
}else{
    exit('验证码正确');
}

5.扩展的图片验证码

<?php
//图片与汉字对应关系
$array =[
    '0'=>'狗',
    '1'=>'鹿',
    '2'=>'狼',
    '3'=>'熊猫',
    '4'=>'猫',
];
$rand = mt_rand(0, 4);
//保存
session_start();
$_SESSION['imageCode'] = $array[$rand];
//输出图像
$contents = file_get_contents("../image/$rand.jpeg");
header('content-type:image/jpeg');
echo $contents;

 

 

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