php header()函数实现文件下载的例子

<?php

/**
 * 文件下载
 *
**/

header("Content-type:text/html;charset=utf-8");

download('web/www.111cn.net .txt', 'txt文件下载');
 
function download($file, $down_name){

 $suffix = substr($file,strrpos($file,'.')); //获取文件后缀
 $down_name = $down_name.$suffix; //新文件名，就是下载后的名字

 //判断给定的文件存在与否
 if(!file_exists($file)){
  die("您要下载的文件已不存在，可能是被删除");
 }
 $fp = fopen($file,"r");
 $file_size = filesize($file);
 //下载文件需要用到的头
 header("Content-type: application/octet-stream");
 header("Accept-Ranges: bytes");
 header("Accept-Length:".$file_size);
 header("Content-Disposition: attachment; filename=".$down_name);
 $buffer = 1024;
 $file_count = 0;
 //向浏览器返回数据
 while(!feof($fp) && $file_count < $file_size){
  $file_con = fread($fp,$buffer);
  $file_count += $buffer;
  echo $file_con;
 }
 fclose($fp);
}

?>

<?php
header('Content-Type: text/html; charset=UTF-8');
 
define( "WB_AKEY" , 'xxxxxxxxxx' );
define( "WB_SKEY" , 'xxxxxxxxxxxxxxxxxxxxxxxxx' );
define( "WB_CALLBACK_URL" , 'http://xxxxxxxxxxxx/callback.php' );//回调地址
*这里的回调地址是指如果用户同意授权,页面跳转至 YOUR_REGISTERED_REDIRECT_URI/?code=CODE     //YOUR_REGISTERED_REDIRECT_URI 就是你的回调地址。
那就第一步需要首先引导用户进行授权。

include_once( 'config.php' );
include_once( 'saetv2.ex.class.php' );
 
$o = new SaeTOAuth( WB_AKEY , WB_SKEY );
 
$code_url = $o->getAuthorizeURL( CANVAS_PAGE );
 
echo "<a href=$code_url>授权</a>";

//授权地址为：
 
https://api.weibo.com/oauth2/authorize?client_id=YOUR_CLIENT_ID&response_type=code&redirect_uri=YOUR_REGISTERED_REDIRECT_URI</pre>

/**
* 根据用户UID或昵称获取用户资料
*
* 按用户UID或昵称返回用户资料，同时也将返回用户的最新发布的微博。
* <br />对应API：users/show
*
* @access public
* @param mixed $uid_or_name 用户UID或微博昵称。
* @return array
*/
function show_user( $uid_or_name )
{
return $this->request_with_uid( 'https://api.t.sina.com.cn/users/show.json' , $uid_or_name );
}

insert into v95_hits(hitsid,catid) select id,catid from v95_soft;
//可以不用转，太慢了

update v95_hits as a left join dp_softlist as b on a.hitsid=b.softid
set a.weekviews=b.softweekhits,a.monthviews=b.softmonthhits,a.dayviews=b.softdayhits,a.views=b.softallhits;
 
update v95_hits set hitsid=concat('c-12-',hitsid);

http:///admin.php?m=admin&c=index&a=related （最后执行，很慢）
php代码：

public function related(){
 set_time_limit(0);
 $sql = "select id,keywords from v95_soft";
 $result = $this->db->query($sql);
 while ($r = mysql_fetch_assoc($result)) {
  $softid = $r['id'];
  $keywords = $r['keywords'];
  $keywords = explode(",", $keywords);
  $related = '';
  foreach ($keywords as $keyword) {
   $sql = "select softidlist from dp_tag where tagname='$keyword' ";
   $result2 = $this->db->query($sql);
   while ($r2 = mysql_fetch_assoc($result2)) {
    $related = $related.','.$r2['softidlist'];
   }
  }
  $related = explode(",", $related);
  $related = array_filter($related);
  shuffle($related);
  $related = array_slice($related, 0,10);
  $related = implode("|", $related);
  $sql =  "update v95_soft_data set relation = '$related' where id = $softid ";
  $this->db->query($sql);
 }
 echo 'OK';
}

insert into v95_hits(hitsid,catid) select CONCAT('c-14-',id),catid from v95_danji;

//判断远程文件
function check_remote_file_exists($url)
{
$curl = curl_init($url);
// 不取回数据
curl_setopt($curl, CURLOPT_NOBODY, true);
// 发送请求
$result = curl_exec($curl);
$found = false;
// 如果请求没有发送失败
if ($result !== false) {
// 再检查http响应码是否为200
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode == 200) {
$found = true;
}
}
curl_close($curl);

return $found;
}

$url = 'http://www.111cn.net /img/qrcode_for_phpddt.JPG';
 
stream_context_set_default(
    array(
        'http' => array(
             'timeout' => 1,
            )
    )
);

 
$headers = get_headers($url);
 
if(preg_match('/200/',$headers[0])) {
    echo '文件存在';
} else {
    echo '文件不存在';
}