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    ▪php session_start()出错原因分析及解决方法       错误提示： Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent 原因：在session_start()之前如果有输出内容，会出错， 解决办法：在session_start()之前加上ob_start();.........

    ▪php 强制下载文件实现代码       代码如下:<?php $file = 'monkey.gif'; if (file_exists($file)) {     header('Content-Description: File Transfer');     header('Content-Type: application/octet-stream');     header('Content-Disposition: attachment; filename='.basename($.........

    ▪php获取qq用户昵称和在线状态（实例分析）       QQ通过返回不同的图片,来表示在线或离线,图标也随之变换，既然图片不同,那么,返回的HTTP头信息中的Content-Length 也一定不同,而且,彩色图片一定会比同样子的暗色图片要大,于是,找出某个样.........

代码如下:

<?php
error_reporting(-1);
ob_start();//不加会出错，无法写入session
register_shutdown_function('close');

 
echo 1;
 session_start();

$_SESSION['password']='mima2ddddddddddddddda2';

function close()
    {
        if(session_id()!=='')
            @session_write_close();
    }
?>
<a href="/blog_article/index2.html" >index2</a>

代码如下:

<?php
error_reporting(-1);
ob_start();//不加会出错，无法读取session
?
echo 1;
 session_start();

echo $_SESSION['password'];
var_dump($_SESSION);
?>
<a href="/blog_article/index.html" >index</a>

代码如下:

<?php
$file = 'monkey.gif';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
?>
?
<?php
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=ins.jpg"); 
readfile("imgs/test_Zoom.jpg");
?>

代码如下:

<?phpfunction get_qq_status($uin)
{
 error_reporting(0);
 $f=file_get_contents('http://wpa.qq.com/pa?p=1:'.$uin.':4');
 if(!$f) return(true);
 foreach($http_response_header as $val)
 {
  if(strpos($val,'Content-Length')!==false)
  {
   return(intval(substr($val,16,50))>1000);
  }
 }
}

?>

代码如下:

<?
function tphp_qq_online( $uin )
{
    $reques  = "GET /pa?p=1:".$uin.":1 HTTP/1.1rn";
    $reques .= "Host: wpa.qq.comrn";
    $reques .= "User-Agent: PHP_QQ_SPYrnrn";

    if ( !( $socket = socket_create( AF_INET, SOCK_STREAM, SOL_TCP ) ) ) return(-1);
    if ( !( socket_connect( $socket, "wpa.qq.com", 80 ) ) ) return(-1);
    if ( !( socket_write( $socket, $reques ) ) ) return(-1);
    if ( !( $respon = socket_read( $socket, 1024, PHP_BINARY_READ ) ) ) return(-1);;
    socket_close( $socket );

    $field = explode( "rn", $respon ); 
    for ( $i=0; $i<count($field); $i++ ) {
        if ( strncasecmp($field[$i], "Location:", 9) == 0 ) {
            if ( strpos( $field[$i], "online") ) {
                $ret = 1;
            } else if ( strpos( $field[$i], "offline") ) {
                $ret = 0;
            } else { 
                $ret = -1;
            } // if
            break;
        } // if
    } // for

    return( $ret );
}
/* }}} */

 

echo tphp_qq_online( 561272831 );

?>

代码如下:

//获取QQ状态
function getQQState($qq){
    $url ='http://wpa.qq.com/pa?p=2:'.$qq.':41&r=' . time ();
 $headInfo = get_headers($url,1);
 $length = $headInfo['Content-Length'];
 if ($length==1243) {
  return true;
 }else {
  return false;
 }
}
//获取QQ昵称
function getQQNick($qq){
 $str = file_get_contents('http://r.qzone.qq.com/cgi-bin/user/cgi_personal_card?uin='.$qq);
 $pattern = '/'.preg_quote('"nickname":"','/').'(.*?)'.preg_quote('",','/').'/i';
 preg_match ( $pattern,$str, $result );
 return $result[1];
}
//获取QQ姓名
function getQQName($qq){
 //$qqArr = include 'friendArr.php';//预先设置的
 //$username = $qqArr[$qq];
 if (!$username) {
  $username = getQQNick($qq);
 }
 return $username;
}