php图形验证码，扭曲+干扰+数字+字母+阴影+随机颜色

<?php
function getAuthImage($text) {
   $im_x = 35*strlen($text);
   $im_y = 40;
   $im = imagecreatetruecolor($im_x,$im_y);
   $grey=imagecolorallocate($im,100,100,100);//灰色阴影
   $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);

   $font = 'D:\SOURCECODEPRO-MEDIUM.TTF';

   for ($i=0;$i<strlen($text);$i++)
   {
       $tmp =substr($text,$i,1);
       $array = array(-1,1);
       $p = array_rand($array);
       $an = $array[$p]*mt_rand(1,20);//角度
       $size = 28;
       $text_c = ImageColorAllocate($im, mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));   //随机颜色
       imagettftext($im, $size, $an, 17+$i*$size, 37, $grey, $font, $tmp); //灰色阴影
       imagettftext($im, $size, $an, 15+$i*$size, 35, $text_c, $font, $tmp); //输出验证码
   }

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

   imagefill($distortion_im, 16, 13, $buttum_c);
   for ( $i=0; $i<$im_x; $i++) {
       for ( $j=0; $j<$im_y; $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*0.1)*4) , $j , $rgb);
           }
       }
   }
   //加入干扰象素;
   $count = 260;//干扰像素的数量
   for($i=0; $i<$count; $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);
   }

   $rand = mt_rand(5,30);
   $rand1 = mt_rand(15,25);
   $rand2 = mt_rand(5,10);
   for ($yy=$rand; $yy<=+$rand+2; $yy++){
       for ($px=-80;$px<=25*strlen($text);$px=$px+0.1)
       {
           $x=$px/$rand1;
           if ($x!=0)
           {
               $y=sin($x);
           }
           $py=$y*$rand2;

           imagesetpixel($distortion_im, $px+80, $py+$yy, $text_c); //加入曲线
       }
   }

   //设置文件头;
   Header("Content-type: image/JPEG");

   //以PNG格式将图像输出到浏览器或文件;
   ImagePNG($distortion_im);

   //销毁一图像,释放与image关联的内存;
   ImageDestroy($distortion_im);
   ImageDestroy($im);
}

function make_rand($length="32"){//验证码文字生成函数
   $str="abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ";
   $result="";
   for($i=0;$i<$length;$i++){
       $num[$i]=rand(0,25);
       $result.=$str[$num[$i]];
   }
   return $result;
}

function make_rand_strnum($length = "4")
{
   //随机种子
$char_str = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ';
$num_str = '23456789';
$char_str_len = strlen($char_str)-1;
$num_str_len = strlen($num_str)-1;
$checkcode = $code = '';
//生成随机码
$t = 0;
for($i=0;$i<$length;$i++){
//设置字体大小
$fontsize = 6;
//设置数字
$code = substr($char_str,rand(0,$char_str_len),1);


if($i==3 && $t==($length-1))//全部字符1+1+1
{
$code = substr($num_str,rand(0,$num_str_len),1);
}
elseif($i==3 && $t==(($length-1)*2))//全部数字2+2+2
{
$code = substr($char_str,rand(0,$char_str_len),1);
}
else{//其他正常情况
$k= rand(1,2);
$t = $t + $k;
if ($k==2)
{
$code = substr($num_str,rand(0,$num_str_len),1);
}
}
$checkcode .= $code;
}
//echo $checkcode;exit;
return $checkcode;
}

//输出调用
$checkcode = make_rand_strnum(4);
session_start();//将随机数存入session中
$_SESSION['jn_checkcode']=strtolower($checkcode);
getAuthImage($checkcode);
?>

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php图形验证码，扭曲+干扰+数字+字母+阴影+随机颜色