每天学习PHP函数之fsockopen

lichaoyue888

　　这个函数是Discuz封装好的dfopen。我加了一下注释。创作权归Discuz所有。
　　就是不知道有没有好的学习curl的函数。呵。
　　

<?php
function dfopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE, $ip = '', $timeout = 15, $block = TRUE)
{
$return = '';
$uri = parse_url($url);
$host = $uri['host'];
$path = $uri['path'] ? $uri['path'].($uri['query'] ? '?'.$uri['query'] : '') : '/';
$port = !empty($uri['port']) ? $uri['port'] : 80;
if($post) {
$out = "POST $path HTTP/1.0\r\n";
$out .= "Accept: */*\r\n";
//$out .= "Referer: $boardurl\r\n";
$out .= "Accept-Language: zh-cn\r\n";
$out .= "Content-Type: application/x-www-form-urlencoded\r\n";
$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
$out .= "Host: $host\r\n";
$out .= 'Content-Length: '.strlen($post)."\r\n";
$out .= "Connection: Close\r\n";
$out .= "Cache-Control: no-cache\r\n";
$out .= "Cookie: $cookie\r\n\r\n";
$out .= $post;
} else {
$out = "GET $path HTTP/1.0\r\n";
$out .= "Accept: */*\r\n";
//$out .= "Referer: $boardurl\r\n";
$out .= "Accept-Language: zh-cn\r\n";
$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
$out .= "Host: $host\r\n";
$out .= "Connection: Close\r\n";
$out .= "Cookie: $cookie\r\n\r\n";
}
$fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);
if(!$fp) {
return '';//note $errstr : $errno \r\n
} else {
//集阻塞/非阻塞模式流,$block==true则应用流模式
stream_set_blocking($fp, $block);
//设置流的超时时间
stream_set_timeout($fp, $timeout);
@fwrite($fp, $out);
//从封装协议文件指针中取得报头／元数据
$status = stream_get_meta_data($fp);
//timed_out如果在上次调用 fread() 或者 fgets() 中等待数据时流超时了则为 TRUE,下面判断为流没有超时的情况
if(!$status['timed_out'])
{
while (!feof($fp)) {
if(($header = @fgets($fp)) && ($header == "\r\n" ||  $header == "\n")) {
break;
}
}
$stop = false;
//如果没有读到文件尾
while(!feof($fp) && !$stop) {
//看连接时限是否=0或者大于8192  =》8192  else =》limit  所读字节数
$data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
$return .= $data;
if($limit) {
$limit -= strlen($data);
$stop = $limit <= 0;
}
}
}
@fclose($fp);
return $return;
}
}
$result = dfopen("http://localhost/ret.php",0,"a=3&b=4");
var_dump($result);
?>
　　我的ret.php里面只有这么个东东。别见笑。只当学习了
　　

<?php
if($_POST['a'] == '' || $_POST['b'] == '')
echo "xxx";
else
echo "yyy";
?>