<?php
/*********************
*????securityCode.class.php
*????驗證碼(數字,字母,數字字母混合,中文)
********************/
class?SecurityCode{
????private?$img_width;
????private?$img_height;
????private?$mode;//1全部數字，2全部字母，3數字字母混合，4全部中文
????private?$text="的一是不了能好都然沒日于起還發成事只作當想看文無開手十用主行方又如前所本見經頭面公同三已老從動兩長知民樣現分將外但身些與高意進把法此實回二理美點月明其種聲全工己話兒者向情部正名定女問力機給等幾很業最間新什打便位因重被走電四第門相次東政?？谑菇涛髟倨秸媛犑罋庑疟鄙訇P并內加化由卻代軍產入先山五太水萬市眼體別處總才場師書比住員九笑性通目華報立馬命張活難神數件安表原車白應路期叫死常提感金何更反合放做系計或司利受光王果親界及今京務制解各任至清物臺象記邊共風戰干接它許八特覺望直服毛林題建南度統色字請交愛讓";

????private?$imageResource;//資源

????public?function?__construct($width,$height,$mode){
????????$this->init($width,$height,$mode);
????}
????
????/*
????*????@function?初始化參數
????*????@param?$width圖片寬度?$height圖片高度?$驗證碼的模式
????*/
????public?function?init($width,$height,$mode){
????????$this->img_width=$width;
????????$this->img_height=$height;
????????$this->mode=$mode;
????}

????public?function?getSecurityCodeImg(){
????????header("content-type:image/png");
????????$this->imageResource=imagecreatetruecolor($this->img_width,$this->img_height);
????????$white=imagecolorallocate($this->imageResource,255,255,255);
????????imagefill($this->imageResource,0,0,$white);
????????//寫內容
????????$this->setContent();
????????//干擾點
????????$this->setPixel();
????????//隨機線
????????$this->setLine();
????????//橢圓線
????????$this->setArc();
????????//以png數據格式繪制圖片并輸出
????????imagepng($this->imageResource);
????????//銷毀資源
????????imagedestroy($this->imageResource);
????}

????/*
????*????@function?寫內容
????*/
????public?function?setContent(){????????
????????$codeArr=$this->getCode();
????????//開啟session
????????session_start();
????????$_SESSION["SecurityCode"]=implode("",$codeArr);
????????foreach($codeArr?as?$key=>$value){
????????????$rantcolor=imagecolorallocate($this->imageResource,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120));//因為0-120為深色
????????????$fontsize=mt_rand(13,15);
????????????$angle=mt_rand(-10,10);
????????????$x=$key*intval($this->img_width/4)+mt_rand($fontsize,$fontsize*2);
????????????$y=mt_rand(25,50);
????????????$fontfile="./msyh.ttc";//字體所在的文件路徑名
????????????imagefttext($this->imageResource,$fontsize,$angle,$x,$y,$rantcolor,$fontfile,$value);
????????}
????}
????
????/*
????*????@function?設定干擾元素
????*/
????public?function?setPixel(){
????????$black=imagecolorallocate($this->imageResource,0,0,0);
????????for($i=0;$i<200;$i++){
????????????imagesetpixel($this->imageResource,mt_rand(0,$this->img_width),mt_rand(0,$this->img_height),$black);
????????}
????}
????
????/*
????*????@function?設定干擾線
????*/
????public?function?setLine(){
????????$black=imagecolorallocate($this->imageResource,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120));
????????imageline($this->imageResource,mt_rand(0,$this->img_width),mt_rand(0,$this->img_height),mt_rand(0,$this->img_width),mt_rand(0,$this->img_height),$black);
????}

????/*
????*????@function?設定干擾橢圓線
????*/
????public?function?setArc(){
????????$white=imagecolorallocate($this->imageResource,0,0,0);
????????$cx=mt_rand(0,$this->img_width);
????????$cy=mt_rand(0,$this->img_height);
????????$w=mt_rand(0,$this->img_width);
????????$h=mt_rand(0,$this->img_height);
????????imagearc($this->imageResource,$cx,$cy,$w,$h,?0,?360,?$white);
????}

????/*
????*????@function?獲得驗證碼數組
????*????@return?array
????*/
????public?function?getCode(){
????????$tmp_arr=array();
????????if($this->mode==1){
????????????//全部數字的
????????????$tmp_arr=$this->getNumericCode();
????????}
????????else?if($this->mode==2){
????????????//全部字母
????????????$tmp_arr=$this->getEnCode();
????????}
????????else?if($this->mode==3){
????????????//數字與字母混合
????????????$tmp_arr=$this->getMixedCode();
????????}
????????else?if($this->mode==4){
????????????//全部中文
????????????$tmp_arr=$this->getChinaCode();
????????}
????????return?$tmp_arr;
????}
????
????/*
????*????@function?獲得全數字數組
????*/
????public?function?getNumericCode(){
????????$codeArr=array();
????????for($i=0;$i<4;$i++){
????????????$codeArr[]=mt_rand(0,9);
????????}
????????return?$codeArr;
????}
????
????/*
????*????@function?獲得全字母數組
????*/
????public?function?getEnCode(){
????????$codeArr=array();
????????for($i=0;$i<4;$i++){
????????????$rant=mt_rand(1,2);
????????????if($rant==1){
????????????????$codeArr[]=chr(mt_rand(65,90));
????????????}
????????????else{
????????????????$codeArr[]=chr(mt_rand(97,122));
????????????}
????????}
????????return?$codeArr;
????}
????
????/*
????*????@function?獲得字母與數字的混合數組
????*/
????public?function?getMixedCode(){
????????$codeArr=array();
????????for($i=0;$i<4;$i++){
????????????$rant=mt_rand(1,3);
????????????if($rant==1){
????????????????$codeArr[]=mt_rand(0,9);
????????????}
????????????else?if($rant==2){
????????????????$codeArr[]=chr(mt_rand(65,90));
????????????}
????????????else{
????????????????$codeArr[]=chr(mt_rand(97,122));
????????????}
????????}
????????return?$codeArr;
????}
????
????/*
????*????@function?獲得全中文數組
????*/
????public?function?getChinaCode(){
????????//header("content-type:text/html;charset=utf-8");
????????$str_arr=str_split($this->text,3);//因為utf8里中文占3個字節
????????$codeArr=array();
????????for($i=0;$i<4;$i++){
????????????$rant=mt_rand(0,count($str_arr)-1);
????????????$codeArr[]=$str_arr[$rant];
????????}
????????return?$codeArr;
????}
}
$sc=new?SecurityCode(200,60,4);
$sc->getSecurityCodeImg();
?>

不足的地方是，無法將橢圓圓弧設定在一個范圍內，衍生出的是字符集的不同ASCII、GBK、Unicode、UTF8的使用環境。