php生成动态验证码gif图片

只看该作者 · 发表于 2018-2-14 05:42:15

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。
0){// 屏蔽第一帧
   $top=0;
   for($k=0;$kGetAnimation();
}

/**
*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 $-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)?(($GIF_disCOL=($GIF_red>-1&&$GIF_grn>-1&&$GIF_blu>-1)?($GIF_red |($GIF_grnBUF[]=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*(2BUF[$i]{10})&0x07))),$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);$iBUF[0]{10})&0x80){
   $cmap=3*(2BUF [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){
$Locals_str=13+3*(2 BUF[$i]{10})&0x07));
$Locals_end=strlen($this->BUF[$i])-$Locals_str-1;
$Locals_tmp=substr($this->BUF[$i],$Locals_str,$Locals_end);
$Global_len=2BUF [0]{10})&0x07);
$Locals_len=2BUF[$i]{10})&0x07);
$Global_rgb=substr($this->BUF[0],13,3*(2BUF[0]{10})&0x07)));
$Locals_rgb=substr($this->BUF[$i],13,3*(2BUF[$i]{10})&0x07)));
$Locals_ext="!\xF9\x04".chr(($this->DIS>0)&0xFF).chr(($d>>8)&0xFF)."\x0\x0";
if($this->COL>-1&&ord($this->BUF[$i]{10})&0x80){
   for($j=0;$jBUF[$i]{10})&0x07));$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>0)&0xFF).chr(($d>>8)&0xFF).chr($j)."\x0";
      break;
      }
   }
}
switch($Locals_tmp{0}){
   case "!":
      $Locals_($Locals_tmp,8,10);
      $Locals_tmp=substr($Locals_tmp,18,strlen($Locals_tmp)-18);
      break;
   case ",":
      $Locals_($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.$Locals_$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.$Locals_$Locals_rgb.$Locals_tmp);
      }
   }else{
      $byte=ord($Locals_img{9});
      $byte|=0x80;
      $byte&=0xF8;
      $byte|=(ord($this->BUF[$i]{10})&0x07);
      $Locals_{9}=chr($byte);
      $this->GIF.=($Locals_ext.$Locals_$Locals_rgb.$Locals_tmp);
   }
}else{
   $this->GIF.=($Locals_ext.$Locals_$Locals_tmp);
}
$this->;
  }
  function GIFAddFooter(){
$this->GIF.=";";
  }
  function GIFBlockCompare($GlobalBlock,$LocalBlock,$Len){
for($i=0;$i>8)&0xFF));
  }
  function GetAnimation(){
return($this->GIF);
  }
}
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
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。


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