php生成动态验证码gif图片

这篇文章主要介绍了php生成动态验证码gif图片的相关资料，需要的朋友可以参考下

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 $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)?(($GIF_disCOL=($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 "!": $Locals_img=substr($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>8)&0xFF)); } function GetAnimation(){ return($this->GIF); } }

php生成动态验证码用法示例：