Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > body text

php生成动态验证码gif图片_PHP

WBOY
Release： 2016-05-30 08:44:16
Original
936 people have browsed it

这是一个通过php生成的动态验证码图片的示例，重点是可以运行哦！下面先发下效果图：

下面是php生成动态验证码需要用到的相关类和函数。

<&#63;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&#63;$string:((time()%2==0)&#63;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)&#63;$GIF_lop:0; 
    $this->DIS=($GIF_dis>-1)&#63;(($GIF_dis<3)&#63;$GIF_dis:3):2; 
    $this->COL=($GIF_red>-1&&$GIF_grn>-1&&$GIF_blu>-1)&#63;($GIF_red |($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); 
  }  
}
Copy after login

php生成动态验证码用法示例：

/*调用示例*/ 
session_start(); 
$checkCode=''; 
$chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789'; 
for($i=0;$i<4;$i++){ 
  $checkCode.=substr($chars,mt_rand(0,strlen($chars)-1),1); 
} 
$_SESSION['code']=strtoupper($checkCode);// 记录session 
ImageCode($checkCode,60);// 显示GIF动画
Copy after login

以上就是php如何生成动态验证码的实现方法，希望对大家的学习有所帮助。

Related labels：
php generates verification code
source：php.cn
Previous article：PHP经典面试题之设计模式(经常遇到)_PHP Next article：php限制文件下载速度的代码_PHP
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
Cypress test to intercept Zoom URL I have a test case that ends up redirecting to a Zoom link. I'm trying to avoid the browse...
From 2024-04-04 16:16:37
0
1
340
Open phone number in shopping cart using php verification opencart3<divclass="form-group"><labelclass="col-sm-2control-label...
From 2024-03-31 22:44:47
0
1
298
Preload text into form fields using URL query strings I want to generate a URL for this web page that pre-populates two CeDiplomaValidation form...
From 2024-03-30 19:21:10
0
1
271
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template