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: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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