Fsockopen smooth, fwrite failure of the reasons for what

What are the reasons for Fsockopen success and fwrite failure?

Testing both locally and on a Windows server is stable.

But on the Linux server, Fsockopen every time is also successful, but fwrite most of the failure, a long time to succeed.

Has anyone ever met such a situation?
In addition//comment mark that part, who can explain next.

The code is as follows:

PHP Code

  $matches = Parse_url ($url);    !isset ($matches [' Host ']) && $matches [' host '] = ';    !isset ($matches [' path ']) && $matches [' path '] = ';    !isset ($matches [' query ']) && $matches [' query '] = ';    !isset ($matches [' Port ']) && $matches [' port '] = ';    $host = $matches [' Host ']; $path = $matches [' Path ']? $matches [' Path ']. ($matches [' query ']? '?'.    $matches [' query ']: '): '/'; $port =!empty ($matches [' Port '])?    $matches [' Port ']: 80;        if ($post) {$out = "post $path http/1.0\r\n";        $out. = "Accept: */*\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. = "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: $errno \ r \ n} else {stream_set_blocking ($fp, $block);        Stream_set_timeout ($fp, $timeout); Var_dump ($FP);        @fwrite ($fp, $out);//comment mark/* $status = Stream_get_meta_data ($FP); if (! $status [' timed_out ']) {while (!feof ($fp)) {if ($header = @fgets ($fp)) && ($header  = = "\ r \ n" | |                $header = = "\ n")) {break;            }} $stop = false; while (!feof ($FP) &&! $stop) {$data = Fread ($fp, ($limit = = 0 | | $limit > 8192 8192: $limit)) ;               $return. = $data;                    if ($limit) {$limit-= strlen ($data);                $stop = $limit <= 0;        }}}*///Comment tag @fclose ($fp);    return true; }

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Check the read and write of the file.
------Solution--------------------

PHP Code

/* for the application of the landlord, here is some information on TCP sockets */$status = Stream_get_meta_data ($FP);/* Here is the check T Whether the CP connection timed out */if (! $status [' timed_out ']) {/* If there is no timeout, then the data is read until a file terminator is encountered */while (!feof ($fp)) {/* as this is read HT  TP header information, blank line ID header information ends, so break */if ($header = @fgets ($fp)) && ($header = = "\ r \ n" | |                $header = = "\ n")) {break; }}/* here is the body that reads HTTP, personally think the processing here is somewhat rough, at least first look at the HTTP response header there is no content-length based on it to handle, if not read the following */$stop = FA            Lse while (!feof ($FP) &&! $stop) {/* read up to 8192 bytes ($limit decrement) */$data = Fread ($fp, ($limit = = 0 | | $limit & Gt 8192?                8192: $limit));/* Connect the contents of the read to the return string */$return. = $data;                    if ($limit) {$limit-= strlen ($data);                $stop = $limit <= 0; }}} 
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