function make_rand($length="32"){//验证码文字生成函数

$str="abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz1234567890";

$result="";

for($i=0;$i

$num[$i]=rand(0,61);

$result.=$str[$num[$i]];

}

return $result;

}

$checkcode = make_rand(5);

$im_x=160;

$im_y=32;

function make_crand($length="5") {

$string = '';

for($i=0;$i

$string .= chr(rand(0xb0,0xf7)).chr(rand(0xa1,0xfe));

}

return $string;

}

function getauthimage($text , $im_x = 230 , $im_y = 32) {

$im = imagecreatetruecolor($im_x,$im_y);

$text_c = imagecolorallocate($im, mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));

$tmpc0=mt_rand(100,255);

$tmpc1=mt_rand(100,255);

$tmpc2=mt_rand(100,255);

$buttum_c = imagecolorallocate($im,$tmpc0,$tmpc1,$tmpc2);

imagefill($im, 16, 13, $buttum_c);

//echo $text;

$font = 'c://windows//fonts//simsun.ttc';

//echo strlen($text);

$text=iconv("gb2312","utf-8",$text);

//echo mb_strlen($text,"utf-8");

for ($i=0;$i

{

$tmp =mb_substr($text,$i,1,"utf-8");

$array = array(-1,0,1);

$p = array_rand($array);

$an = $array[$p]*mt_rand(1,9);//角度

$size = 20;

imagettftext($im,$size,$an,10+$i*$size*2,25,$text_c,$font,$tmp);

}

$distortion_im = imagecreatetruecolor ($im_x, $im_y);

imagefill($distortion_im, 16, 13, $buttum_c);

for ( $i=0; $i

for ( $j=0; $j

$rgb = imagecolorat($im, $i , $j);

if( (int)($i+20+sin($j/$im_y*2*m_pi)*10) <= imagesx($distortion_im) && (int)($i+20+sin($j/$im_y*2*m_pi)*10) >=0 ) {

imagesetpixel ($distortion_im, (int)($i+10+sin($j/$im_y*2*m_pi-m_pi*0.5)*3) , $j , $rgb);

}

}

}

//加入干扰象素;

$count = 600;//干扰像素的数量

for($i=0; $i

$randcolor = imagecolorallocate($distortion_im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

imagesetpixel($distortion_im, mt_rand()%$im_x , mt_rand()%$im_y , $randcolor);

}

$line_c=5;

//imageline

for($i=0; $i < $line_c; $i++) {

$linecolor = imagecolorallocate($distortion_im, 17, 158, 20);

$lefty = mt_rand(1, $im_x-1);

$righty = mt_rand(1, $im_y-1);

imageline($distortion_im, 0, $lefty, imagesx($distortion_im), $righty, $linecolor);

}

header("content-type: image/png");

//以png格式将图像输出到浏览器或文件;

//imagepng($im);

imagepng($distortion_im);

//销毁一图像,释放与image关联的内存;

imagedestroy($distortion_im);

imagedestroy($im);

}

?>

用法示例如下：

getauthimage(make_crand(5));

?>

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