php生成图片验证码(动态数字和加减运算)
一、动态gif验证码
预览效果：
<?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?$string:((time()%2==0)?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)?$gif_lop:0;
$this->dis=($gif_dis>-1)?(($gif_dis<3)?$gif_dis:3):2;
$this->col=($gif_red>-1&&$gif_grn>-1&&$gif_blu>-1)?($gif_red |($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);
}
}
二、加减法验证码
加减验证：
<?php
namespace mobile\components;
/**
* @author fenghuo
*
* 改造的加减法验证类
* 使用示例 verifycode::get(1,2);
* 验证示例 verifycode::check($code);
*/
class verifycode
{
/**
* php验证码
*/
public static function get($one,$two,$prefix = '', $font_size = 28)
{
//文件头...
ob_get_clean();
header("content-type: image/png;charset=utf-8;");
//创建真彩色白纸
$width = $font_size*5;
$height = $font_size+1;
$im = @imagecreatetruecolor($width, $height) or die("建立图像失败");
//获取背景颜色
$background_color = imagecolorallocate($im, 255, 255, 255);
//填充背景颜色
imagefill($im, 0, 0, $background_color);
//获取边框颜色
$border_color = imagecolorallocate($im, 200, 200, 200);
//画矩形，边框颜色200,200,200
imagerectangle($im,0,0,$width - 1, $height - 1,$border_color);
//逐行炫耀背景，全屏用1或0
for($i = 2;$i < $height - 2;$i++) {
//获取随机淡色
$line_color = imagecolorallocate($im, rand(200,255), rand(200,255), rand(200,255));
//画线
imageline($im, 2, $i, $width - 1, $i, $line_color);
}
//设置印上去的文字
$firstnum = $one;
$secondnum = $two;
$actionstr = $firstnum > $secondnum ? '-' : '+';
//获取第1个随机文字
$imstr[0]["s"] = $firstnum;
$imstr[0]["x"] = rand(2, 5);
$imstr[0]["y"] = rand(1, 4);
//获取第2个随机文字
$imstr[1]["s"] = $actionstr;
$imstr[1]["x"] = $imstr[0]["x"] + $font_size - 1 + rand(0, 1);
$imstr[1]["y"] = rand(1,5);
//获取第3个随机文字
$imstr[2]["s"] = $secondnum;
$imstr[2]["x"] = $imstr[1]["x"] + $font_size - 1 + rand(0, 1);
$imstr[2]["y"] = rand(1, 5);
//获取第3个随机文字
$imstr[3]["s"] = '=';
$imstr[3]["x"] = $imstr[2]["x"] + $font_size - 1 + rand(0, 1);
$imstr[3]["y"] = 3;
//获取第3个随机文字
$imstr[4]["s"] = '?';
$imstr[4]["x"] = $imstr[3]["x"] + $font_size - 1 + rand(0, 1);
$imstr[4]["y"] = 3;
//文字
$text = '';
//写入随机字串
for($i = 0; $i < 5; $i++) {
//获取随机较深颜色
$text_color = imagecolorallocate($im, rand(50, 180), rand(50, 180), rand(50, 180));
$text .= $imstr[$i]["s"];
//画文字
imagechar($im, $font_size, $imstr[$i]["x"], $imstr[$i]["y"], $imstr[$i]["s"], $text_color);
}
session_start();
$_session[$prefix.'verifycode'] = $firstnum > $secondnum ? ($firstnum - $secondnum) : ($firstnum + $secondnum);
//显示图片
imagepng($im);
//销毁图片
imagedestroy($im);
}
public static function check($code)
{
if(trim($_session[$prefix.'verifycode']) == trim($code)) {
return true;
} else {
return false;
}
}
}