<?php function make_rand($length="32"){//验证码文字生成函数         $str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";     $result="";     for($i=0;$i<$length;$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;$i<$length;$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;$i<mb_strlen($text);$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; $i<$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*0.5)*3) , $j , $rgb);              }          }      }      //加入干扰象素;     $count = 600;//干扰像素的数量     for($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);     }     $line_c=5;      //imageline      for($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); } ?>

<?php getAuthImage(make_crand(5)); ?>