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]];
}
返回$结果；
}
$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 $string;
}
函数 getAuthImage($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) =0 ) {
imagesetpixel ($ Distortion_im, (int)($i 10 sin($j/$im_y*2*M_PI-M_PI*0.5)*3) , $ j , $rgb);
}
}
}
//加入干预象素;
$count = 600;//干扰像素的数量
for($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);
}
$line_c=5;
//图像行
for($i=0; $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, $linecolor);
}
Header("内容类型：图像/PNG");
// 以PNG格式将图像输出到浏览器或文件;
//ImagePNG($im);
ImagePNG($ Distortion_im);
//思考一个图像，释放与图像关联的内存；
ImageDestroy($ Distortion_im);
ImageDestroy($im);
}
?>
用法示例如下：
getAuthImage(make_crand(5));
?>
