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三款php 中文验证码生成与调用方法

Jun 13, 2016 am 09:48 AM
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三款php 中文验证码生成与调用方法 在php中要生成中文验证码就必须做与生成验证验证码不一样的操作,因为GD函数只接受UTF8格式编码的文字,所以在用php生成中文验证码时面要前首先要进行编码转换,操作php的iconv可以实例。

三款php教程 中文验证码生成与调用方法
在php中要生成中文验证码就必须做与生成验证验证码不一样的操作,因为gd函数只接受utf8格式编码的文字,所以在用php生成中文验证码时面要前首先要进行编码转换,操作php的iconv可以实例。
*/

$ch_str="你要生成中文验证码汉字";
$str=array();
for ($i=0;$i {
    $str[]=$ch_str[$i].$ch_str[$i+1].$ch_str[$i+2];
}
//图片的长和高
$image_x=200;
$image_y=100;
$im = imagecreate($image_x,$image_y);
//这里取图片底色为白色
$bkg = imagecolorallocate($im,255,255,255);
//显示的字体样式,这个要把文件放到对应的目录中,如果你没有文件就去window的字体文件中找一个吧。
$fnt = "simfang.ttf";
//为图像分配一些颜色
$white=imagecolorallocate($im,234,185,95);
//在图片上画椭圆弧,指定下坐标点
imagearc($im, 150, 8, 20, 20, 75, 170, $white);
imagearc($im, 180, 7,50, 30, 75, 175, $white);
//在图片上画一条线段,指定下坐标点
imageline($im,20,20,180,30,$white);
imageline($im,20,18,170,50,$white);
imageline($im,25,50,80,50,$white);
//乱点的数量
$noise_num=3000;
$line_num=80;
//各种混乱字符的颜色
$rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
$noise_color=imagecolorallocate($im,0x00,0x00,0x00);
$font_color=imagecolorallocate($im,0x00,0x00,0x00);
for($i=0;$i {
    //在一个坐标点上画一个单一像素,这个点上面定义了,是黑色的。
    imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
}

for($i=0;$i {
    $line_color=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    //在两个坐标点间画一条线,颜色在上面定义
    imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);   
}
$randnum=rand(0,count($str)-4);
//保持是偶数
if ($randnum%2)
{
    $randnum+=1;   
}
$str1=$str[$randnum].$str[$randnum+1];
for ($i=0;$i {
    imagettftext($im, rand(28,32), rand(0,70), rand(($image_x/4)*$i+$image_x/10,($image_x/4)*$i+$image_x/8), rand($image_y/2+$image_y/10,$image_y/2+$image_y/5), $font_color, $fnt, $str[$randnum+$i]);   
}
imagepng($im);
imagedestroy($im);

//生成中文验证码二
$str="中文汉字";
$image_x=110;
$image_y=110;
$im = imagecreate($image_x,$image_y);
$bkg = imagecolorallocate($im,255,255,255);
$fnt = "hb.ttf"; //显示的字体样式
$white=imagecolorallocate($im,234,185,95);
imagearc($im, 150, 8, 20, 20, 75, 170, $white);
imagearc($im, 180, 7,50, 30, 75, 175, $white);
imageline($im,20,20,180,30,$white);
imageline($im,20,18,170,50,$white);
imageline($im,25,50,80,50,$white);
$noise_num=3000;
$line_num=80;
imagecolorallocate($im,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
$noise_color=imagecolorallocate($im,0x00,0x00,0x00);
$font_color=imagecolorallocate($im,0x00,0x00,0x00);
$line_color=imagecolorallocate($im,0x00,0x00,0x00);
for($i=0;$i imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
for($i=0;$i imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
$randnum=rand(0,strlen($str)-4);
if ($randnum%2)$randnum+=1;
$str1=substr($str,$randnum,4);
$str2 = iconv("gb2312","utf-8",$str1);//验证汉字在$str1里面

imagettftext($im, rand(28,32), rand(0,70), rand(25,27), rand(70,100), $font_color, $fnt, $str2);
imagepng($im);
imagedestroy($im);

//把汉字放在数组
/*
gd函数只接受utf8格式编码的文字,所以在写文字前首先要进行编码转换。php自带的iconv和mbstring库都可以完成这项工作
*/

$randcode=array('宠');
$codetable=array();
$fp=fopen("gb2312.txt","r");
while($line=fgets($fp))
    $codetable[hexdec(substr($line,0,6))]=substr($line,7,6);
fclose($fp); 

//gb2312转utf8
function gb2utf8($gbstr)
{
    global $codetable;
    if(trim($gbstr)=="")
        return $gbstr;
    $ret="";
    $utf8="";
    while($gbstr)
    {
        if(ord(substr($gbstr,0,1))>127)
        {
            $thisw=substr($gbstr,0,2);
            $gbstr=substr($gbstr,2,strlen($gbstr));
            $utf8="";
            @$utf8=u2utf8(hexdec($codetable[hexdec(bin2hex($thisw))-0x8080]));

 

            if($utf8!="")
            for($i=0;$i                 $ret.=chr(substr($utf8,$i,3));
        }
        else
        {
            $ret.=substr($gbstr,0,1);
            $gbstr=substr($gbstr,1,strlen($gbstr));
        }
    }
    return $ret;

 

//unicode转utf8
function u2utf8($c)
{
    $str="";
    if($c         $str.=$c;
    elseif($c     {
        $str.=(0xc0|$c>>6);
        $str.=(0x80|$c&0x3f);
    }
    elseif($c     {
        $str.=(0xe0|$c>>12);
        $str.=(0x80|$c>>6&0x3f);
        $str.=(0x80|$c&0x3f);
    }
    elseif($c     {
        $str.=(0xf0|$c>>18);
        $str.=(0x80|$c>>12&0x3f);

 

        $str.=(0x80|$c>>6&0x3f);
        $str.=(0x80|$c&0x3f);
    }
    return $str;

//生成附加码
function create_excode($length)
{
 global $randcode;
    header("content-type: image/png");
 $image_x=$length*30;    //图片宽度
 $image_y=40;            //图片高度
    $noise_num=80*$length;   //杂点数量
    $line_num=$length-2;      //干扰线数量
 $image=imagecreate($image_x,$image_y);
 imagecolorallocate($image,0xff,0xff,0xff);                  //设定背景颜色
 $rectangle_color=imagecolorallocate($image,0xaa,0xaa,0xaa); //边框颜色
 $noise_color=imagecolorallocate($image,0x00,0x00,0x00);     //杂点颜色
 $font_color=imagecolorallocate($image,0x00,0x00,0x00);      //字体颜色
 $line_color=imagecolorallocate($image,0x33,0x33,0x33);      //干扰线颜色

 //加入杂点
    for($i=0;$i   imagesetpixel($image,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);

 $font_face="simkai.ttf";    //字体
    $x=2;
    $session_code='';
    for($i=0;$i     {
        $code=$randcode[mt_rand(0,count($randcode)-1)];
     imagettftext($image,18,mt_rand(-6,6),$x,29,$font_color,$font_face,gb2utf8($code));
        $x+=30;
        $session_code.=$code;
    }
    @session_start();
    $_session['excode']=$session_code;  //把附加码的值放在session中

 
    //加入干扰线
    for($i=0;$i      imageline($image,mt_rand(0,$image_x),mt_rand(0,$image_y),
                    mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
 imagerectangle($image,0,0,$image_x-1,$image_y-1,$rectangle_color);  //加个边框
 imagepng($image);
 imagedestroy($image);
}
create_excode(6);

 

// 使用的时候直接用html语法:三款php 中文验证码生成与调用方法调用就可以了,在服务端做验证时取session存储的验证字符与用户提交的字符进行比较,相同则通过验证

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