首页
所有分类
TAGS
文字工具 EMOJI BIBLE
编程 PHP

PHP使用GIFEncoder类生成的GIF动态图片验证码

Posted in PHP onJuly 01, 2014

相信很多人都想过如何用PHP生成GIF动画来实现动态图片验证码，以下是实现过程。
ImageCode函数通过GIFEncoder类实现的GIF动画的PHP源代码，有兴趣的朋友可以研究一下。

效果如图：PHP使用GIFEncoder类生成的GIF动态图片验证码

/**

 

* ImageCode 生成GIF图片验证

 

* @param $string 字符串

 

* @param $width 宽度

 

* @param $height 高度

 

* */

 

function ImageCode($string = '', $width = 75, $height = 25)

 

{

 

$authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999));

 

$board_width = $width;

 

$board_height = $height;

 

// 生成一个32帧的GIF动画

 

for($i = 0; $i < 32; $i++)

 

{

 

ob_start();

 

$image = imagecreate($board_width, $board_height);

 

imagecolorallocate($image, 0,0,0);

 

// 设定文字颜色数组

 

$colorList[] = ImageColorAllocate($image, 15,73,210);

 

$colorList[] = ImageColorAllocate($image, 0,64,0);

 

$colorList[] = ImageColorAllocate($image, 0,0,64);

 

$colorList[] = ImageColorAllocate($image, 0,128,128);

 

$colorList[] = ImageColorAllocate($image, 27,52,47);

 

$colorList[] = ImageColorAllocate($image, 51,0,102);

 

$colorList[] = ImageColorAllocate($image, 0,0,145);

 

$colorList[] = ImageColorAllocate($image, 0,0,113);

 

$colorList[] = ImageColorAllocate($image, 0,51,51);

 

$colorList[] = ImageColorAllocate($image, 158,180,35);

 

$colorList[] = ImageColorAllocate($image, 59,59,59);

 

$colorList[] = ImageColorAllocate($image, 0,0,0);

 

$colorList[] = ImageColorAllocate($image, 1,128,180);

 

$colorList[] = ImageColorAllocate($image, 0,153,51);

 

$colorList[] = ImageColorAllocate($image, 60,131,1);

 

$colorList[] = ImageColorAllocate($image, 0,0,0);

 

$fontcolor = ImageColorAllocate($image, 0,0,0);

 

$gray = ImageColorAllocate($image, 245,245,245);

 

$color = imagecolorallocate($image, 255,255,255);

 

$color2 = imagecolorallocate($image, 255,0,0);

 

imagefill($image, 0, 0, $gray);

 

$space = 15; // 字符间距

 

if($i > 0) // 屏蔽第一帧

 

{

 

for ($k = 0; $k < strlen($authstr); $k++)

 

{

 

$colorRandom = mt_rand(0,sizeof($colorList)-1);

 

$float_top = rand(0,4);

 

$float_left = rand(0,3);

 

imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]);

 

}

 

}

 

for ($k = 0; $k < 20; $k++)

 

{

 

$colorRandom = mt_rand(0,sizeof($colorList)-1);

 

imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]);

 

}

 

// 添加干扰线

 

for($k = 0; $k < 3; $k++)

 

{

 

$colorRandom = mt_rand(0, sizeof($colorList)-1);

 

// $todrawline = rand(0,1);

 

$todrawline = 1;

 

if($todrawline)

 

{

 

imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]);

 

}

 

else

 

{

 

$w = mt_rand(0,$board_width);

 

$h = mt_rand(0,$board_width);

 

imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]);

 

}

 

}

 

imagegif($image);

 

imagedestroy($image);

 

$imagedata[] = ob_get_contents();

 

ob_clean();

 

++$i;

 

}

 

$gif = new GIFEncoder($imagedata);

 

Header ('Content-type:image/gif');

 

echo $gif->GetAnimation();

 

}

GIFEncoder类源码：

<?php

Class GIFEncoder {

    var $GIF = "GIF89a";                /* GIF header 6 bytes        */

    var $VER = "GIFEncoder V2.06";        /* Encoder version                */

    var $BUF = Array ( );

    var $LOP =  0;

    var $DIS =  2;

    var $COL = -1;

    var $IMG = -1;

    var $ERR = Array (

    'ERR00' =>"Does not supported function for only one image!",

    'ERR01' =>"Source is not a GIF image!",

    'ERR02' =>"Unintelligible flag ",

    'ERR03' =>"Could not make animation from animated GIF source",

    );

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFEncoder...

    ::

    */

    function GIFEncoder        (

    $GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,

    $GIF_red, $GIF_grn, $GIF_blu, $GIF_mod

    ) {

        if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {

            printf        ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );

            exit        ( 0 );

        }

        $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;

        $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;

        $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?

        ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;

        for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {

            if ( strToLower ( $GIF_mod ) == "url" ) {

                $this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );

            }

            else if ( strToLower ( $GIF_mod ) == "bin" ) {

                $this->BUF [ ] = $GIF_src [ $i ];

            }

            else {

                printf        ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );

                exit        ( 0 );

            }

            if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {

                printf        ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );

                exit        ( 0 );

            }

            for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {

                switch ( $this->BUF [ $i ] { $j } ) {

                    case "!":

                        if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {

                            printf        ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );

                            exit        ( 0 );

                        }

                        break;

                    case ";":

                        $k = FALSE;

                        break;

                }

            }

        }

        GIFEncoder::GIFAddHeader ( );

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

            GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );

        }

        GIFEncoder::GIFAddFooter ( );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddHeader...

    ::

    */

    function GIFAddHeader ( ) {

        $cmap = 0;

        if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {

            $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );

            $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7                );

            $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap        );

            $this->GIF .= "!/377/13NETSCAPE2.0/3/1" . GIFEncoder::GIFWord ( $this->LOP ) . "/0";

        }

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddFrames...

    ::

    */

    function GIFAddFrames ( $i, $d ) {

        $Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) );

        $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;

        $Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );

        $Global_len = 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 );

        $Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

        $Global_rgb = substr ( $this->BUF [ 0  ], 13,

        3 * ( 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 ) ) );

        $Locals_rgb = substr ( $this->BUF [ $i ], 13,

        3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );

        $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 0 ) .

        chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "/x0/x0";

        if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {

            for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {

                if        (

                ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >>  0 ) & 0xFF &

                ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >>  8 ) & 0xFF &

                ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF

                ) {

                    $Locals_ext = "!/xF9/x04" . chr ( ( $this->DIS << 2 ) + 1 ) .

                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "/x0";

                    break;

                }

            }

        }

        switch ( $Locals_tmp { 0 } ) {

            case "!":

                $Locals_img = substr ( $Locals_tmp, 8, 10 );

                $Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );

                break;

            case ",":

                $Locals_img = substr ( $Locals_tmp, 0, 10 );

                $Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );

                break;

        }

        if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {

            if ( $Global_len == $Locals_len ) {

                if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {

                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

                }

                else {

                    $byte  = ord ( $Locals_img { 9 } );

                    $byte |= 0x80;

                    $byte &= 0xF8;

                    $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );

                    $Locals_img { 9 } = chr ( $byte );

                    $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

                }

            }

            else {

                $byte  = ord ( $Locals_img { 9 } );

                $byte |= 0x80;

                $byte &= 0xF8;

                $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

                $Locals_img { 9 } = chr ( $byte );

                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

            }

        }

        else {

            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

        }

        $this->IMG  = 1;

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFAddFooter...

    ::

    */

    function GIFAddFooter ( ) {

        $this->GIF .= ";";

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFBlockCompare...

    ::

    */

    function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {

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

            if        (

            $GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||

            $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||

            $GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }

            ) {

                return ( 0 );

            }

        }

        return ( 1 );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GIFWord...

    ::

    */

    function GIFWord ( $int ) {

        return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );

    }

    /*

    :::::::::::::::::::::::::::::::::::::::::::::::::::

    ::

    ::        GetAnimation...

    ::

    */

    function GetAnimation ( ) {

        return ( $this->GIF );

    }

}

?>

PHP使用GIFEncoder类生成的GIF动态图片验证码

- Author -

junjie

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

PHP 相关文章推荐
example1.php
Oct 09 PHP
PHP中ADODB类详解
Mar 25 PHP
PHP常用函数小技巧
Sep 11 PHP
php 图像函数大举例（非原创）
Jun 20 PHP
php iconv() : Detected an illegal character in input string
Dec 05 PHP
php删除与复制文件夹及其文件夹下所有文件的实现代码
Jan 23 PHP
ThinkPHP查询中的魔术方法简述
Jun 25 PHP
ThinkPHP验证码和分页实例教程
Aug 22 PHP
CI框架集成Smarty的方法分析
May 17 PHP
PHP实现RSA签名生成订单功能【支付宝示例】
Jun 06 PHP
PHP流Streams、包装器wrapper概念与用法实例详解
Nov 17 PHP
PHP封装curl的调用接口及常用函数详解
May 31 PHP
ThinkPHP模板范围判断输出In标签与Range标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Empty标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Defined标签用法详解
Jun 30 #PHP
ThinkPHP模板判断输出Present标签用法详解
Jun 30 #PHP
ThinkPHP模板比较标签用法详解
Jun 30 #PHP
ThinkPHP模板Switch标签用法示例
Jun 30 #PHP
ThinkPHP之foreach标签使用概述
Jun 30 #PHP
OpenFeign(1) swing(1) Hive(5) HttpClient(1) Windows Server 2022(3) SandBox(1) K8s(1) NTP(1) calc(1) Windows Server(4)
You might like
php使用Cookie控制访问授权的方法
2015/01/21 PHP
浅谈php命令行用法
2015/02/04 PHP
PHP中如何判断exec函数执行成功？
2016/08/04 PHP
PHP链表操作简单示例
2016/10/15 PHP
利用PHP绘图函数实现简单验证码功能的方法
2016/10/18 PHP
JS中如何设置readOnly的值
2013/12/25 Javascript
javascript使用onclick事件改变选中行的颜色
2013/12/30 Javascript
js delete 用法(删除对象属性及变量)
2014/08/24 Javascript
jQuery实现“扫码阅读”功能
2015/01/21 Javascript
体验jQuery和AngularJS的不同点及AngularJS的迷人之处
2016/02/02 Javascript
JS中setTimeout的巧妙用法前端函数节流
2016/03/24 Javascript
JavaScript知识点总结(十一)之js中的Object类详解
2016/05/31 Javascript
sencha ext js 6 快速入门(必看)
2016/06/01 Javascript
nodejs+mongodb aggregate级联查询操作示例
2018/03/17 NodeJs
CKEditor 4.4.1 添加代码高亮显示插件功能教程【使用官方推荐Code Snippet插件】
2019/06/14 Javascript
bootstrap datepicker的基本使用教程
2019/07/09 Javascript
小谈angular ng deploy的实现
2020/04/07 Javascript
matplotlib 输出保存指定尺寸的图片方法
2018/05/24 Python
使用Python的toolz库开始函数式编程的方法
2018/11/15 Python
python opencv摄像头的简单应用
2019/06/06 Python
django foreignkey(外键)的实现
2019/07/29 Python
pytorch 指定gpu训练与多gpu并行训练示例
2019/12/31 Python
python模拟点击网页按钮实现方法
2020/02/25 Python
基于python实现FTP文件上传与下载操作（ftp&amp;sftp协议）
2020/04/01 Python
python requests.get带header
2020/05/05 Python
python 瀑布线指标编写实例
2020/06/03 Python
Django框架安装及项目创建过程解析
2020/09/14 Python
Python批量获取并保存手机号归属地和运营商的示例
2020/10/09 Python
基于Python制作一副扑克牌过程详解
2020/10/19 Python
python通用数据库操作工具 pydbclib的使用简介
2020/12/21 Python
Falconeri美国官网：由羊绒和羊毛制成的针织服装
2018/04/08 全球购物
蒙蒂塞罗商店：Monticello Shop
2018/11/25 全球购物
仓管员岗位责任制
2014/02/19 职场文书
新党章的学习心得体会
2014/11/07 职场文书
经营目标责任书
2015/05/08 职场文书
安全伴我行主题班会
2015/08/13 职场文书