三种php汉字英文验证代码生成程序

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();

if($enablegd)
{
//create captcha
$consts = 'cdfgkmnpqrstwxyz23456';
$vowels = 'aek23456789';
for ($x = 0; $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);

//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);

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

if(function_exists('imagettftext'))
{
imagettftext($im, 12, rand(30, -30), 5, rand(14, 16), $foregroundArr[rand(0,3)],'ALGER.TTF', $string[0]);
imagettftext($im, 12, rand(50, -50), 20, rand(14, 16), $foregroundArr[rand(0,3)], 'ARIALNI.TTF', $string[1]);
imagettftext($im, 12, rand(50, -50), 35, rand(14, 16), $foregroundArr[rand(0,3)],'ALGER.TTF', $string[2]);
imagettftext($im, 12, rand(30, -30), 50, rand(14, 16), $foregroundArr[rand(0,3)],'arial.ttf', $string[3]);
}
else
{
imagestring($im, 5, 3, floor(rand(0,5))-1, $string[0], $foregroundArr[rand(0,3)]);
imagestring($im, 5, 16, floor(rand(0,5))-1, $string[1], $foregroundArr[rand(0,3)]);
imagestring($im, 5, 23, floor(rand(0,5))-1, $string[2], $foregroundArr[rand(0,3)]);
imagestring($im, 5, 33, floor(rand(0,5))-1, $string[3], $foregroundArr[rand(0,3)]);
}
//strikethrough

$border = imagecolorallocate($im, 133, 153, 193);
//imagefilledrectangle($aimg, 0, 0, $x_size - 1, $y_size - 1, $back);
imagerectangle($im, 0, 0, $imageX - 1, $imageY - 1, $border);

$pointcol = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
for ($i=0;$i {
imagesetpixel($im,rand(2,$imageX-2),rand(2,$imageX-2),$pointcol);
}
//random shapes
for ($x=0; $x {
if(mt_rand(0,$x)%2==0)
{
imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999));
imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2);
}
else
{
imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999));
imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground);
}
}
//output to browser
header("content-type:image/png ");
imagepng($im);
imagedestroy($im);
}
else
{
exit("不能建立！");}
?>

function verify($user_str){//从cookie中对比用户的输入
if(md5($cookie_str)==$_COOKIE['vrify'])
return 1;
else
return 0;
}
function c2ch($num){
$ch_h = chr(substr($num,0,2)+160);
$ch_l = chr(substr($num,2,2)+160);
return $ch_h.$ch_l;
}
function num_rand(){
mt_srand((double)microtime() * 1000000);
$d= mt_rand(16,36);
$n= mt_rand(1,19);
return c2ch($d*100+$n);
}
$k[0]=num_rand();
$k[1]=num_rand();
$k[2]=num_rand();
$k[3]=num_rand();
$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 {
$pointcol = imagecolorallocate($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);
?>
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