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php生成动态验证码加减算法验证码简单验证码

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

预览效果:

<?php
/**
*ImageCode 生成包含验证码的GIF图片的函数
*@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
            $top=0;
            for($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);
            $todrawline=1;
            if($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
**/
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 $ERR=Array(
        'ERR00'=>"Does not supported function for only one image!", 
        'ERR01'=>"Source is not a GIF image!", 
        'ERR02'=>"Unintelligible flag ", 
        'ERR03'=>"Could not make animation from animated GIF source", 
   );
    function GIFEncoder($GIF_src,$GIF_dly=100,$GIF_lop=0,$GIF_dis=0, $GIF_red=0,$GIF_grn=0,$GIF_blu=0,$GIF_mod='bin'){
        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($i=0,$src_count=count($GIF_src);$i<$src_count;$i++){
            if(strToLower($GIF_mod)=="url"){
                $this->BUF[]=fread(fopen($GIF_src [$i],"rb"),filesize($GIF_src [$i]));
           }elseif(strToLower($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,$count_buf=count($this->BUF);$i<$count_buf;$i++){
            GIFEncoder::GIFAddFrames($i,$GIF_dly[$i]);
       }  
        GIFEncoder::GIFAddFooter();
    }  
    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";
        }  
    }  
    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;
    }  
    function GIFAddFooter(){
        $this->GIF.=";";
    }  
    function GIFBlockCompare($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);
    }  
    function GIFWord($int){
       return(chr($int&0xFF).chr(($int>>8)&0xFF));
    }  
    function GetAnimation(){
        return($this->GIF);
    }  
}

加减验证:

<?php
namespace mobile\components;
/** 
 * @author fenghuo 
 * 
 * 改造的加减法验证类 
 * 使用示例 VerifyCode::get(1,2); 
 * 验证示例 VerifyCode::check($code); 
 */ 
class VerifyCode 
{ 
  /** 
   * php验证码 
   */ 
  public static function get($one,$two,$prefix = '', $font_size = 28) 
  { 
    //文件头... 
    ob_get_clean();
    header("Content-type: image/png;charset=utf-8;"); 
    //创建真彩色白纸 
    $width      = $font_size*5; 
    $height      = $font_size+1; 
    $im        = @imagecreatetruecolor($width, $height) or die("建立图像失败"); 
    //获取背景颜色 
    $background_color = imagecolorallocate($im, 255, 255, 255); 
    //填充背景颜色 
    imagefill($im, 0, 0, $background_color); 
    //获取边框颜色 
    $border_color   = imagecolorallocate($im, 200, 200, 200); 
    //画矩形,边框颜色200,200,200 
    imagerectangle($im,0,0,$width - 1, $height - 1,$border_color); 
    //逐行炫耀背景,全屏用1或0 
    for($i = 2;$i < $height - 2;$i++) { 
      //获取随机淡色 
      $line_color = imagecolorallocate($im, rand(200,255), rand(200,255), rand(200,255)); 
      //画线 
      imageline($im, 2, $i, $width - 1, $i, $line_color); 
    } 
    //设置印上去的文字 
    $firstNum = $one; 
    $secondNum = $two; 
    $actionStr = $firstNum > $secondNum ? '-' : '+'; 
    //获取第1个随机文字 
    $imstr[0]["s"] = $firstNum; 
    $imstr[0]["x"] = rand(2, 5); 
    $imstr[0]["y"] = rand(1, 4); 
    //获取第2个随机文字 
    $imstr[1]["s"] = $actionStr; 
    $imstr[1]["x"] = $imstr[0]["x"] + $font_size - 1 + rand(0, 1); 
    $imstr[1]["y"] = rand(1,5); 
    //获取第3个随机文字 
    $imstr[2]["s"] = $secondNum; 
    $imstr[2]["x"] = $imstr[1]["x"] + $font_size - 1 + rand(0, 1); 
    $imstr[2]["y"] = rand(1, 5); 
    //获取第3个随机文字 
    $imstr[3]["s"] = '='; 
    $imstr[3]["x"] = $imstr[2]["x"] + $font_size - 1 + rand(0, 1); 
    $imstr[3]["y"] = 3; 
    //获取第3个随机文字 
    $imstr[4]["s"] = '?'; 
    $imstr[4]["x"] = $imstr[3]["x"] + $font_size - 1 + rand(0, 1); 
    $imstr[4]["y"] = 3; 
    //文字 
    $text = ''; 
    //写入随机字串 
    for($i = 0; $i < 5; $i++) { 
      //获取随机较深颜色 
      $text_color = imagecolorallocate($im, rand(50, 180), rand(50, 180), rand(50, 180)); 
      $text .= $imstr[$i]["s"]; 
      //画文字 
      imagechar($im, $font_size, $imstr[$i]["x"], $imstr[$i]["y"], $imstr[$i]["s"], $text_color); 
    } 
    session_start();
    $_SESSION[$prefix.'verifycode'] = $firstNum > $secondNum ? ($firstNum - $secondNum) : ($firstNum + $secondNum); 
    //显示图片 
    ImagePng($im); 
    //销毁图片 
    ImageDestroy($im); 
  } 
  public static function check($code) 
  { 
    if(trim($_SESSION[$prefix.'verifycode']) == trim($code)) { 
      return true; 
    } else { 
      return false; 
    } 
  } 
}

 yi 简单验证码:

 

1.验证码为全自动区分计算机和人类的图灵测试的缩写。是一种区分用户是计算机和人的公共全自动程序。

2.验证码主要应用场景:登录、注册确定前,发布、回复信息前,疑似机器请求时,做人/机器校验。

3.实现步骤:

(1)生成底图;

       依赖php图片处理库GD,http://php.net/manual/zh/book.image.php

(2)生成验证内容;

         产生随机数,使用php函数rand();

(3)生成验证码图片;

(4)校验验证内容

          需要php操作SESSION基础,将验证内容保存在服务器端;前端Ajax基础

4.开发前的准备:

(1)php运行环境

(2)检查PHP是否支持GD,通过在php文件中使用函数 phpinfo()输出查看即可。
  

1.新建一个captcha.php文件,写入下列代码。实现验证码图片

<?php
 
//必须至于顶部,多服务器端记录验证码信息,便于用户输入后做校验
     session_start();
 
    //默认返回的是黑色的照片
    $image = imagecreatetruecolor(100, 30);
    //将背景设置为白色的
    $bgcolor = imagecolorallocate($image, 255, 255, 255);
    //将白色铺满地图
    imagefill($image, 0, 0, $bgcolor);
 
    //空字符串,每循环一次,追加到字符串后面  
    $captch_code='';
 
   //验证码为随机四个数字
    for ($i=0; $i < 4; $i++) { 
        $fontsize=6;
        $fontcolor=imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
        
        //产生随机数字0-9
        $fontcontent = rand(0,9);
        $captch_code.= $fontcontent;
       //数字的位置,0,0是左上角。不能重合显示不完全
        $x=($i*100/4)+rand(5,10);
        $y=rand(5,10);
         imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
    }
      
 
  
   $_SESSION['authcode'] = $captch_code;
//为验证码增加干扰元素,控制好颜色,
//点   
    for ($i=0; $i < 200; $i++) { 
        $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
        imagesetpixel($image, rand(1,99), rand(1,29), $pointcolor);
    }
 
//为验证码增加干扰元素线   
    for ($i=0; $i < 3; $i++) { 
        $linecolor = imagecolorallocate($image,rand(80,220),rand(80,220),rand(80,220));
        imageline($image, rand(1,99), rand(1,29),rand(1,99), rand(1,29) ,$linecolor);
    }
 
    header('content-type:image/png');
    imagepng($image);
 
    //销毁
    imagedestroy($image);


查看效果如下:刷新一次,内容或会变化一次;

2.新建一个form.php文件,写入下列代码。实现校验:

<?php
 
    if (isset($_REQUEST['authcode'])) {
        session_start();
 
        if (strtolower($_REQUEST['authcode'])==$_SESSION['authcode']) {
            echo'<font color ="#0000CC"> 输出正确</font>';
            # code...
        }else{
            echo $_REQUEST['authcode'];
            
                      

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