php生成中文验证码程序-PHP源码

今天无意中想起写验证码数字加汉字,下面是代码比较容易没什么好说

先来看看效果图吧.

还不错吧?

Header("Content-type: image/PNG");//生成图片的类型
$str = "的一是在了不和有大这主中人蚕亿矩";//随便回的你可以自己增加
$Width = 240;//图片高度
$imgHeight = 40;//图片宽度
$C_img = imagecreate($Width,$imgHeight);
$bgColor = ImageColorAllocate($C_img,255,255,255);
$f_fOnt= "heiti.ttf";//这里可以选择其它的字体
$white=imagecolorallocate($C_img,234,185,95);
imagearc($C_img, 150, 8, 20, 20, 75, 170, $white);
imagearc($C_img, 180, 7,50, 30, 75, 175, $white);
imageline($C_img,20,20,180,30,$white);
imageline($C_img,20,18,170,50,$white);
imageline($C_img,25,50,80,50,$white);
$noise_num = 800;//杂点的数据
$line_num = 20;//线条的数量
imagecolorallocate($C_img,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($C_img,0xAA,0xAA,0xAA);
$noise_color=imagecolorallocate($C_img,0x00,0x00,0x00);
$font_color=imagecolorallocate($C_img,0x00,0x00,0x00);
$line_color=imagecolorallocate($C_img,0x00,0x00,0x00);
for($i=0;$i<$noise_num;$i++){
imagesetpixel($C_img,mt_rand(0,$Width),mt_rand(0,$imgHeight),$noise_color);
}
for($i=0;$i<$line_num;$i++){
imageline($C_img,mt_rand(0,$Width),mt_rand(0,$imgHeight),mt_rand(0,$Width),mt_rand(0,$imgHeight),$line_color);
}
$randnum=rand(0,strlen($str)-4);
if($randnum%2)$randnum+=1;
$str = substr($str,$randnum,8);
$str = iconv("GB2312","UTF-8",$str).rand(0,1000);//转换编码
ImageTTFText($C_img, 20, 0, 16, 30, $font_color, $f_font, $str);
ImagePNG($C_img);
ImageDestroy($C_img);
?>

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