php 生成验证码图片不显示问题

<?php
/*
* 验证码产生程序
*/
$letter = '';
//获取随机数字
for ($i=0; $i<2; $i++) {
    $letter .= chr(mt_rand(48,57));
}
//获取随机字母
for ($i=0; $i<2; $i++) {
    $letter .= chr(mt_rand(65,90));
}
//重构字符顺序
$strs = str_split($letter);
shuffle ($strs);
$rndstring = "";
while (list ( , $str) = each ($strs)) {
    $rndstring .= $str;
}

//如果支持GD，则绘图
if(function_exists("imagecreate"))
{
    //向浏览器写入cookie
    setcookie("zjs_ckstr", md5( strtolower($rndstring) ), time()+300,'/');//验证码有效期5分钟   
    $rndcodelen = strlen($rndstring);
    //图片大小
    $im = imagecreate(100,30);
    //$im = imagecreatefromgif("code.gif");
    //字体
    $font_type = dirname(dirname(__FILE__))."/data/font/AvantGardeBookBT.ttf";
    //背景颜色
    $backcolor = imagecolorallocate($im,255,255,255);  
    //字体色
    //不支持 imagettftext
    $fontColor = ImageColorAllocate($im, 0,0,0);
    //支持 imagettftext
    $fontColor2 = ImageColorAllocate($im, 0,0,0);
    //阴影
    $fontColor1 = ImageColorAllocate($im, 255,255,25);
    //添加背景杂点
    $pixColor = imagecolorallocate($im, 199, 199, 199);//杂点颜色
    for($j=0; $j<1000; $j++){
        imagesetpixel($im, rand(0,100), rand(0,30), $pixColor);
    }
    //添加背景线
    for($j=0; $j<=3; $j++){
        //背景线颜色
        $lineColor1 = ImageColorAllocate($im, rand(0, 255),rand(0, 255),rand(0, 255));
        //背景线方向大小
        imageline($im,rand(0,40),rand(3,25),rand(40,88),rand(3,25),$lineColor1);
    }   

    $strposs = array();
    //文字
    for($i=0;$i<$rndcodelen;$i++){
      if(function_exists("imagettftext")){
          $strposs[$i][0] = $i*16+17;//x轴
          $strposs[$i][1] = mt_rand(20,23);//y轴
          imagettftext($im, 5, 5, $strposs[$i][0]+1, $strposs[$i][1]+1, $fontColor1, $font_type, $rndstring[$i]);
      } else{
          imagestring($im, 5, $i*16+7, mt_rand(2, 4), $rndstring[$i], $fontColor);
      }
    }
    //文字
    for($i=0;$i<$rndcodelen;$i++){
      if(function_exists("imagettftext")){
          imagettftext($im, 16,5, $strposs[$i][0]-1, $strposs[$i][1]-1, $fontColor2, $font_type, $rndstring[$i]);
      }
    }

  header("Pragma:no-cachern");
  header("Cache-Control:no-cachern");
  header("Expires:0rn");
  //输出特定类型的图片格式，优先级为 gif -> jpg
  if(function_exists("imagegif")){
        header("content-type:image/gifrn");
      imagegif($im);
  }else{
        header("content-type:image/jpegrn");
      imagejpeg($im);
  }
  ImageDestroy($im);
}
?>

header('Content-Type: image/png');

<?php
/**
 * SOCKET扩展函数
 * @copyright (c) 2013
 * @author Qiufeng <fengdingbo@gmail.com>
 * @link http://www.111cn.net
 * @version 1.0
 */
 
/**
 * Post Request
 *
 * @param string $url 
 * @param array $data
 * @param string $referer
 * @return array
 */
if ( ! function_exists('socket_post'))
{
 function socket_post($url, $data, $referer='')
 {
  if( ! is_array($data))
  {
   return;
  }
 
  $data = http_build_query($data);
  $url = parse_url($url);
 
  if ( ! isset($url['scheme']) || $url['scheme'] != 'http')
  {
   die('Error: Only HTTP request are supported !');
  }
 
  $host = $url['host'];
  $path = isset($url['path']) ? $url['path'] : '/';
 
  // open a socket connection on port 80 - timeout: 30 sec
  $fp = fsockopen($host, 80, $errno, $errstr, 30);
 
  if ($fp)
  {
   // send the request headers:
   $length = strlen($data);
   $POST = <<<HEADER
POST {$path} HTTP/1.1
Accept: text/plain, text/html
Referer: {$referer}
Accept-Language: zh-CN,zh;q=0.8
Content-Type: application/x-www-form-urlencodem
Cookie: token=value; pub_cookietime=2592000; pub_sauth1=value; pub_sauth2=value
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17
Host: {$host}
Content-Length: {$length}
Pragma: no-cache
Cache-Control: no-cache
Connection: closern
{$data}
HEADER;
   fwrite($fp, $POST);
   $result = '';
   while(!feof($fp))
   {
    // receive the results of the request
    $result .= fread($fp, 512);
   }
  }
  else
  {
   return array(
     'status' => 'error',
     'error' => "$errstr ($errno)"
     );
  }
 
  // close the socket connection:
  fclose($fp);
 
  // split the result header from the content
  $result = explode("rnrn", $result, 2);
 
  // return as structured array:
  return array(
    'status' => 'ok',
    'header' => isset($result[0]) ? $result[0] : '',
    'content' => isset($result[1]) ? $result[1] : ''
    );
 }
}
 
print_r(socket_post('http://www.111cn.net/', array('name='=>'qiufeng','password'=>md5('www.111cn.net'))));
/* e.g: socket_post('http://www.111cn.net', array('name='=>'qiufeng','password'=>md5('111cn.net'))); */
/* End of file socket_helper.php */

<?php
   
        $remote_server = "111cn.net";
 
        $boundary = "---------------------".substr(md5(rand(0,32000)),0,10);
        
        // Build the header
        $header = "POST /api.php?action=twupload HTTP/1.0rn";
        $header .= "Host: {$remote_server}rn";
        $header .= "Content-type: multipart/form-data, boundary=$boundaryrn";
 
        /*
        // attach post vars
        foreach($_POST AS $index => $value){
            $data .="--$boundaryrn";
            $data .= "Content-Disposition: form-data; name="".$index.""rn";
            $data .= "rn".$value."rn";
            $data .="--$boundaryrn";
        }
        */
        $file_name = "aaa.jpg";
        $content_type = "image/jpg";
 
        $data = '';
        // and attach the file
        $data .= "--$boundaryrn";
 
        $content_file = file_get_contents('aaa.jpg');
        $data .="Content-Disposition: form-data; name="userfile"; filename="$file_name"rn";
        $data .= "Content-Type: $content_typernrn";
        $data .= "".$content_file."rn";
        $data .="--$boundary--rn";
 
       $header .= "Content-length: " . strlen($data) . "rnrn";
                 // Open the connection
 
 
        $fp = fsockopen($remote_server, 80);
        // then just
        fputs($fp, $header.$data);
        // reader
 
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
 
fclose($fp);

function func_chgtitle($str,$len) { //$length我们允许字符串显示的最大长度    
    $tmpstr = "";
    $strlen = $len;
     for($i = 0; $i < $strlen; $i++) {
         if(ord(substr($str, $i, 1)) > 0xa0) {
            $tmpstr .= substr($str, $i, 2);
            $i++;
         } else
            $tmpstr .= substr($str, $i, 1);
     }
     return $tmpstr;

}

        for($i = $start; $i < $strlen;) {
            if (ord ( substr ( $str, $i, 1 ) ) > 0xa0) { // 如果字符串中首个字节的ASCII序数

值大于0xa0,则表示汉字
                $tmpstr .= substr ( $str, $i, 3 ); // 每次取出三位字符赋给变量$tmpstr，即等

于一个汉字
                $i=$i+3; // 变量自加3
            } else{
                $tmpstr .= substr ( $str, $i, 1 ); // 如果不是汉字，则每次取出一位字符赋给

变量$tmpstr
                $i++;
            }
        }
        return $tmpstr; // 返回字符串
    }

$random =rand(0,1000);

或者

<?php
 $rand = mt_rand(1, 100);
 
 echo $rand;
?>

srand((double)microtime()*1000000);
$random =rand(0,1000);

/**
*获取一定范围内的多个随机数字
*/
function yang_numberRand($begin = 0, $end = 20, $limit = 5){
    $rand_array = range($begin, $end);
    shuffle($rand_array); //调用现成的数组随机排列函数
    return array_slice($rand_array, 0, $limit); //截取前$limit个
}

$dirs='e:/pdf'; 

function FileShow($dirs) { 

    $dir=opendir($dirs); 

    while ($f=readdir($dir)) { 

    if($f != '.' && $f != '..'){ 

    $file=$dirs.'/'.$f; 

    if(is_file($file)){ 

        echo 'FileName:'.$file.'<br />'; 

        //echo 'FileName:'.iconv('gb2312','utf-8',$file).'<br />'; 

    }else{ 

        FileShow($file); 

        } 

    } 

    } 

} 

FileShow($dirs);