php验证码实例

验证码实例如下看不懂的先看gd库的那一篇，session不懂的看from提交的数据都哪里了那一篇，欢迎关注

index.php

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>

</head>

<body>

<form name="form" method="post" action="">

    验证码(大写):<br>

    <img src="hcon.php" width="70" height="18" border="0" align="bottom">

    <input type="text" name="yanzhengma">

    <br>

    <input type="Submit" name="Submit" value="登录" >

</form>

</body>

</html>

<?php

session_start();

if(isset($_POST["Submit"]) && $_POST["Submit"]!=""){

    $yanzhengma=$_POST["yanzhengma"];

    if($yanzhengma=="")

    { echo "<script> alert('验证码为空');window.location.href='index.php';</script>";}

    else if($yanzhengma!=$_SESSION["jiancha"]){

        echo "<script> alert('输错了');window.location.href='index.php';</script>";

    }

    else{

        echo "<script> alert('登录成功');window.location.href='index.php';</script>";

    }

}

?>

yanzhengma.php

<?php

class yanzhengma2{

    protected $width;

    protected $height;

    protected $im;

    protected $len;

    protected $code;

    public function __construct($width=100,$height=30,$len=5){

        $this->width=$width;

        $this->height=$height;

        $this->len=$len;

    }

    public function render(){

        $im= imagecreatetruecolor($this->width,$this->height);

        $color=imagecolorallocate($im, 200,200,200);

        imageFill($this->im=$im,0,0,$color);//画布背景填充颜色，默认黑色

        $this->text();

        $this->line();

        $this->pix();

        $this->show();

        return $this->code;

    }

    //显示渲染

    protected function show(){

        header('Content-type:image/png');

        imagepng($this->im);

    }

    //绘制验证码

    protected function text(){

        $font=$font="c:/windows/fonts/simhei.ttf";

        $text='abcdefghigklmnopqrstuvwxyz0123456789';

        for($i=0;$i<$this->len;$i++){

            $x=$this->width/$this->len;

            $angle=mt_rand(-20,20);

            $this->code.=$textn=strtoupper($text[mt_rand(0,strlen($text)-1)]);

            $box=imagettfbbox(20,$angle,$font,$textn);           

            imagettftext(

                $this->im,

                20,$angle,

                $x*$i+10,

                $this->height/2-($box[7]-$box[1])/2,

                $this->textcolor(),

                $font,

                $textn

            );

        }

    }

    //绘制干扰点

    protected function pix(){

        for($i=0;$i<300;$i++){

                imagesetpixel($this->im,mt_rand(0,$this->width),mt_rand(0,$this->height),$this->color());

        }

    }

    //绘制干扰线

    protected function line(){

        for($i=0;$i<6;$i++){

            imagesetthickness($this->im,mt_rand(1,2));

            imageline($this->im,

            mt_rand(0,$this->width),

            mt_rand(0,$this->height),

            mt_rand(0,$this->width),

            mt_rand(0,$this->height),

            $this->color()

        );

        }

    }

    //生成随机颜色

    protected function color(){

        return imagecolorallocate($this->im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

    }

    //生成随机文字颜色（深）

    protected function textcolor(){

            return imagecolorallocate($this->im,mt_rand(0,50),mt_rand(0,50),mt_rand(0,50));

        }

}

?>

hcon.php

<?php

session_start();

include 'yanzhengma.php';

$yanzhengma=new yanzhengma2(200,40);

$code=$yanzhengma->render();

$_SESSION["jiancha"]=$code;

?>

巴特西

php验证码实例

最新文章

热门文章