发一个真正能运行的通过php生成的动态验证码图片的示例。网上下载的好多都报错的，于是自己综合各方面的见解，终于完成了这么一个效果。
下面是php生成动态验证码需要用到的相关类和函数。
<p><?php</p>/**<br />*ImageCode 生成包含验证码的GIF图片的函数<br />*@param $string 字符串<br />*@param $width 宽度<br />*@param $height 高度<br />**/<br />function ImageCode($string='',$width=75,$height=25){<br /> $authstr=$string?$string:((time()%2==0)?mt_rand(1000,9999):mt_rand(10000,99999));<br /> $board_width=$width;<br /> $board_height=$height;<br /> // 生成一个32帧的GIF动画<br /> for($i=0;$i<32;$i++){<br /> ob_start();<br /> $image=imagecreate($board_width,$board_height);<br /> imagecolorallocate($image,0,0,0);<br /> // 设定文字颜色数组 <br /> $colorList[]=ImageColorAllocate($image,15,73,210);<br /> $colorList[]=ImageColorAllocate($image,0,64,0);<br /> $colorList[]=ImageColorAllocate($image,0,0,64);<br /> $colorList[]=ImageColorAllocate($image,0,128,128);<br /> $colorList[]=ImageColorAllocate($image,27,52,47);<br /> $colorList[]=ImageColorAllocate($image,51,0,102);<br /> $colorList[]=ImageColorAllocate($image,0,0,145);<br /> $colorList[]=ImageColorAllocate($image,0,0,113);<br /> $colorList[]=ImageColorAllocate($image,0,51,51);<br /> $colorList[]=ImageColorAllocate($image,158,180,35);<br /> $colorList[]=ImageColorAllocate($image,59,59,59);<br /> $colorList[]=ImageColorAllocate($image,0,0,0);<br /> $colorList[]=ImageColorAllocate($image,1,128,180);<br /> $colorList[]=ImageColorAllocate($image,0,153,51);<br /> $colorList[]=ImageColorAllocate($image,60,131,1);<br /> $colorList[]=ImageColorAllocate($image,0,0,0);<br /> $fontcolor=ImageColorAllocate($image,0,0,0);<br /> $gray=ImageColorAllocate($image,245,245,245);<br /> $color=imagecolorallocate($image,255,255,255);<br /> $color2=imagecolorallocate($image,255,0,0);<br /> imagefill($image,0,0,$gray);<br /> $space=15;// 字符间距<br /> if($i>0){// 屏蔽第一帧<br /> $top=0;<br /> for($k=0;$k<strlen($authstr);$k++){ <br /> $colorRandom=mt_rand(0,sizeof($colorList)-1);<br /> $float_top=rand(0,4);<br /> $float_left=rand(0,3);<br /> imagestring($image,6,$space*$k,$top+$float_top,substr($authstr,$k,1),$colorList[$colorRandom]);<br /> }<br /> }<br /> for($k=0;$k<20;$k++){ <br /> $colorRandom=mt_rand(0,sizeof($colorList)-1);<br /> imagesetpixel($image,rand()%70,rand()%15,$colorList[$colorRandom]);<br /> <br /> }<br /> // 添加干扰线<br /> for($k=0;$k<3;$k++){<br /> $colorRandom=mt_rand(0,sizeof($colorList)-1);<br /> $todrawline=1;<br /> if($todrawline){<br /> imageline($image,mt_rand(0,$board_width),mt_rand(0,$board_height),mt_rand(0,$board_width),mt_rand(0,$board_height),$colorList[$colorRandom]);<br /> }else{<br /> $w=mt_rand(0,$board_width);<br /> $h=mt_rand(0,$board_width);<br /> imagearc($image,$board_width-floor($w / 2),floor($h / 2),$w,$h, rand(90,180),rand(180,270),$colorList[$colorRandom]);<br /> }<br /> }<br /> imagegif($image);<br /> imagedestroy($image);<br /> $imagedata[]=ob_get_contents();<br /> ob_clean();<br /> ++$i;<br /> }<br /> $gif=new GIFEncoder($imagedata);<br /> Header('Content-type:image/gif');<br /> echo $gif->GetAnimation();<br />}<br /><br /><br />/**<br />*GIFEncoder类<br />**/<br />Class GIFEncoder{<br /> var $GIF="GIF89a"; /* GIF header 6 bytes */ <br /> var $VER="GIFEncoder V2.06"; /* Encoder version */ <br /> var $BUF=Array();<br /> var $LOP=0;<br /> var $DIS=2;<br /> var $COL=-1;<br /> var $IMG=-1;<br /> var $ERR=Array(<br /> 'ERR00'=>"Does not supported function for only one image!", <br /> 'ERR01'=>"Source is not a GIF image!", <br /> 'ERR02'=>"Unintelligible flag ", <br /> 'ERR03'=>"Could not make animation from animated GIF source", <br /> );<br /> function GIFEncoder($GIF_src,$GIF_dly=100,$GIF_lop=0,$GIF_dis=0, $GIF_red=0,$GIF_grn=0,$GIF_blu=0,$GIF_mod='bin'){<br /> if(!is_array($GIF_src)&&!is_array($GIF_tim)){<br /> printf("%s: %s",$this->VER,$this->ERR['ERR00']);<br /> exit(0);<br /> } <br /> $this->LOP=($GIF_lop>-1)?$GIF_lop:0;<br /> $this->DIS=($GIF_dis>-1)?(($GIF_dis<3)?$GIF_dis:3):2;<br /> $this->COL=($GIF_red>-1&&$GIF_grn>-1&&$GIF_blu>-1)?($GIF_red |($GIF_grn<<8)|($GIF_blu<<16)):-1;<br /><br /> for($i=0,$src_count=count($GIF_src);$i<$src_count;$i++){<br /> if(strToLower($GIF_mod)=="url"){<br /> $this->BUF[]=fread(fopen($GIF_src [$i],"rb"),filesize($GIF_src [$i]));<br /> }elseif(strToLower($GIF_mod)=="bin"){<br /> $this->BUF [ ]=$GIF_src [ $i ];<br /> }else{<br /> printf("%s: %s(%s)!",$this->VER,$this->ERR [ 'ERR02' ],$GIF_mod);<br /> exit(0);<br /> } <br /> if(substr($this->BUF[$i],0,6)!="GIF87a"&&substr($this->BUF [$i],0,6)!="GIF89a"){<br /> printf("%s: %d %s",$this->VER,$i,$this->ERR ['ERR01']);<br /> exit(0);<br /> } <br /> for($j=(13+3*(2<<(ord($this->BUF[$i]{10})&0x07))),$k=TRUE;$k;$j++){<br /> switch($this->BUF [$i]{$j}){<br /> case "!": <br /> if((substr($this->BUF[$i],($j+3),8))=="NETSCAPE"){<br /> printf("%s: %s(%s source)!",$this->VER,$this->ERR ['ERR03'],($i+1));<br /> exit(0);<br /> } <br /> break;<br /> case ";": <br /> $k=FALSE;<br /> break;<br /> } <br /> } <br /> } <br /> GIFEncoder::GIFAddHeader();<br /> for($i=0,$count_buf=count($this->BUF);$i<$count_buf;$i++){<br /> GIFEncoder::GIFAddFrames($i,$GIF_dly[$i]);<br /> } <br /> GIFEncoder::GIFAddFooter();<br /> } <br /> function GIFAddHeader(){<br /> $cmap=0;<br /> if(ord($this->BUF[0]{10})&0x80){<br /> $cmap=3*(2<<(ord($this->BUF [0]{10})&0x07));<br /> $this->GIF.=substr($this->BUF [0],6,7);<br /> $this->GIF.=substr($this->BUF [0],13,$cmap);<br /> $this->GIF.="!\377\13NETSCAPE2.0\3\1".GIFEncoder::GIFWord($this->LOP)."\0";<br /> } <br /> } <br /> function GIFAddFrames($i,$d){<br /> $Locals_str=13+3*(2 <<(ord($this->BUF[$i]{10})&0x07));<br /> $Locals_end=strlen($this->BUF[$i])-$Locals_str-1;<br /> $Locals_tmp=substr($this->BUF[$i],$Locals_str,$Locals_end);<br /> $Global_len=2<<(ord($this->BUF [0]{10})&0x07);<br /> $Locals_len=2<<(ord($this->BUF[$i]{10})&0x07);<br /> $Global_rgb=substr($this->BUF[0],13,3*(2<<(ord($this->BUF[0]{10})&0x07)));<br /> $Locals_rgb=substr($this->BUF[$i],13,3*(2<<(ord($this->BUF[$i]{10})&0x07)));<br /> $Locals_ext="!\xF9\x04".chr(($this->DIS<<2)+0).chr(($d>>0)&0xFF).chr(($d>>8)&0xFF)."\x0\x0";<br /> if($this->COL>-1&&ord($this->BUF[$i]{10})&0x80){<br /> for($j=0;$j<(2<<(ord($this->BUF[$i]{10})&0x07));$j++){<br /> 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){<br /> $Locals_ext="!\xF9\x04".chr(($this->DIS<<2)+1).chr(($d>>0)&0xFF).chr(($d>>8)&0xFF).chr($j)."\x0";<br /> break;<br /> } <br /> } <br /> } <br /> switch($Locals_tmp{0}){<br /> case "!": <br /> $Locals_img=substr($Locals_tmp,8,10);<br /> $Locals_tmp=substr($Locals_tmp,18,strlen($Locals_tmp)-18);<br /> break;<br /> case ",": <br /> $Locals_img=substr($Locals_tmp,0,10);<br /> $Locals_tmp=substr($Locals_tmp,10,strlen($Locals_tmp)-10);<br /> break;<br /> } <br /> if(ord($this->BUF[$i]{10})&0x80&&$this->IMG>-1){<br /> if($Global_len==$Locals_len){<br /> if(GIFEncoder::GIFBlockCompare($Global_rgb,$Locals_rgb,$Global_len)){<br /> $this->GIF.=($Locals_ext.$Locals_img.$Locals_tmp);<br /> }else{<br /> $byte=ord($Locals_img{9});<br /> $byte|=0x80;<br /> $byte&=0xF8;<br /> $byte|=(ord($this->BUF [0]{10})&0x07);<br /> $Locals_img{9}=chr($byte);<br /> $this->GIF.=($Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp);<br /> } <br /> }else{<br /> $byte=ord($Locals_img{9});<br /> $byte|=0x80;<br /> $byte&=0xF8;<br /> $byte|=(ord($this->BUF[$i]{10})&0x07);<br /> $Locals_img {9}=chr($byte);<br /> $this->GIF.=($Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp);<br /> } <br /> }else{<br /> $this->GIF.=($Locals_ext.$Locals_img.$Locals_tmp);<br /> } <br /> $this->IMG=1;<br /> } <br /> function GIFAddFooter(){<br /> $this->GIF.=";";<br /> } <br /> function GIFBlockCompare($GlobalBlock,$LocalBlock,$Len){<br /> for($i=0;$i<$Len;$i++){<br /> 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}){<br /> return(0);<br /> } <br /> } <br /> return(1);<br /> } <br /> function GIFWord($int){<br /> return(chr($int&0xFF).chr(($int>>8)&0xFF));<br /> } <br /> function GetAnimation(){<br /> return($this->GIF);<br /> } <br /><p>}php生成动态验证码用法示例：
/*调用示例*/
session_start();<br />$checkCode='';<br />$chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';<br />for($i=0;$i<4;$i++){<br /> $checkCode.=substr($chars,mt_rand(0,strlen($chars)-1),1);<br />}<br />$_SESSION['code']=strtoupper($checkCode);// 记录session<br />ImageCode($checkCode,60);// 显示GIF动画
La différence entre la balise d'article et la balise de section
Comment utiliser le logiciel de programmation jsp
Solution d'erreur HTTP 503
Windows vérifie l'état d'occupation des ports
Utilisation de null en Java
Recommandations sur les logiciels de bureau Android
Le rôle de index.html
Que signifie le concept de métaverse ?
![[Web front-end] Démarrage rapide de Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
