PHP 生成中文验证码乱码问题解决

//将要处理的汉字,先由UTF8的汉字转成html实体形式再使用.

代码如下

//示例代码:

$ChineseChar = explode(',',"人,出,来,友,学,孝,仁,义,礼,廉,忠,国,中,易,白,者,火 ,王,金,木,雷,风,龙,虎,天,地, 生,晕,菜,鸟,田,三,百,钱,福 ,爱,情,兽,虫,鱼,九,网,新,度,哎,唉,啊,哦,仪,老,少,日, 月 ,星,肯,各,程");
$k[0]=$ChineseChar[array_rand($ChineseChar)];
$k[1]=$ChineseChar[array_rand($ChineseChar)];
$k[2]=$ChineseChar[array_rand($ChineseChar)];
$k[3]=$ChineseChar[array_rand($ChineseChar)];
$cookie_str=implode('', $k);
setcookie('vrify',md5($cookie_str),time()+600);
$str[0]=iconv('gb2312','UTF-8',$k[0]);
$str[1]=iconv('gb2312','UTF-8',$k[1]);
$str[2]=iconv('gb2312','UTF-8',$k[2]);
$str[3]=iconv('gb2312','UTF-8',$k[3]);
//构造图像
$x_size=100;
$y_size=25;
$font='simhei.ttf';
$pic=imagecreate($x_size,$y_size);
$background_color = imagecolorallocate ($pic, 255, 255, 255);
$foregroundArr = array(imagecolorallocate($pic, rand(0, 20), rand(0, 20), rand(0, 20)),
                                      imagecolorallocate($pic, rand(0, 20), rand(0, 10), rand(245, 255)),
                                      imagecolorallocate($pic, rand(245, 255), rand(0, 20), rand(0, 10)),
                                      imagecolorallocate($pic, rand(245, 255), rand(0, 20), rand(245, 255)));
imagettftext($pic,mt_rand(12,15),mt_rand(-8,8),6,mt_rand(19,22),$foregroundArr[rand(0,3)],$font,$str[0]);
imagettftext($pic,mt_rand(15,17),mt_rand(-8,8),26,20,$foregroundArr[rand(0,3)],$font,$str[1]);
imagettftext($pic,mt_rand(12,15),mt_rand(-8,8),46,20,$foregroundArr[rand(0,3)],$font,$str[2]);
imagettftext($pic,mt_rand(15,17),mt_rand(-8,8),66,mt_rand(19,22),$foregroundArr[rand(0,3)],$font,$str[3]);
for ($i=0;$i<80;$i++)
       {
       $pointcol = imagecolorallocate($pic, rand(0,255), rand(0,255), rand(0,255));
              imagesetpixel($pic,rand(2,$x_size-2),rand(2,$y_size-2),$pointcol);
       }
$border = imagecolorallocate($pic, 133, 153, 193);
imagerectangle($pic, 0, 0, $x_size - 1, $y_size - 1,$border);
imagepng($pic);
imagedestroy($pic);
?>

代码如下

//ini_set('JIS-mapped Japanese Font Support',false);
$pic=imagecreate(250,30);
$black=imagecolorallocate($pic,0,0,0);
$white=imagecolorallocate($pic,255,255,255);
$font="C://WINDOWS//Fonts//simhei.ttf";

$str = '中华人民共和国';
$str = mb_convert_encoding($str, "html-entities","utf-8" );//结果:哪一队优先开球

代码如下

imagettftext($pic,10,0,10,20,$white,$font,$str);

<?php
session_start();
session_set_cookie_params(0,'/');
$enablegd = 1;
$funcs = array('imagecreatetruecolor','imagecolorallocate','imagefill','imageline','imagedestroy','imagecolorallocatealpha','imageellips教程e','imagepng');
foreach($funcs as $func)
{
       if(!function_exists($func))
       {
              $enablegd = 0;
              break;
       }
}
if(!function_exists('ob_gzhandler')) ob_clean();

header("Content-type: image/jpeg");
$filename='./photo.jpg';
$im=imagecreatefromjpeg($filename);
imagecopymerge($im,$pic,0,0,0,0,250,30,50);
imagejpeg($im);

if($enablegd)
{
       //create captcha
       $consts = 'cdfgkmnpqrstwxyz23456';
       $vowels = 'aek23456789';
       for ($x = 0; $x < 6; $x++)
       {
              $const[$x] = substr($consts, mt_rand(0,strlen($consts)-1),1);
              $vow[$x] = substr($vowels, mt_rand(0,strlen($vowels)-1),1);
       }
       $radomstring = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4];
       $_SESSION['checkcode'] = $string = substr($radomstring,0,4); //only display 4 str
       //set up image, the first number is the width and the second is the height
       $imageX = strlen($radomstring)*8;       //the image width
       $imageY = 20;                                          //the image height
       $im = imagecreatetruecolor($imageX,$imageY);

//pChart 示例代码:

       //creates two variables to store color
       $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250));
       $foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)),
                                             imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)),
                                             imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(0, 10)),
                                             imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(245, 255)));
       $foreground2 = imagecolorallocatealpha($im, rand(20, 100), rand(20, 100), rand(20, 100),80);
       $middleground = imagecolorallocate($im, rand(200, 160), rand(200, 160), rand(200, 160));
       $middleground2 = imagecolorallocatealpha($im, rand(180, 140), rand(180, 140), rand(180, 140),80);

/*
Example14: A smooth flat pie graph
*/

       //fill image with bgcolor
       imagefill($im, 0, 0, imagecolorallocate($im, 250, 253, 254));
       //writes string

代码如下

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