Why does fsockopen fail?

What are the causes of fwrite failure when fsockopen is successful? Tested locally and on a WINDOWS Server. However, on a LINUX server, fsockopen is successful every time, but fwrite fails for a long time .. Who has encountered such a situation .. In addition, the // annotation mark that part, which can be explained .. The code is as follows: PHPcode $ match fsockopen is successful. What are the causes of fwrite failure?

Tested locally and on a WINDOWS Server.

However, on a LINUX server, fsockopen is successful every time, but fwrite fails for a long time ..

Who has encountered such a situation ..
In addition, the // annotation mark that part, which can be explained ..

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"; $ o Ut. = "Cookie: $ cookie \ 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";} $ 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); // annotation 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 ;}}} * // annotation Mark @ fclose ($ fp); return true ;}

------ Solution --------------------
Check the file read/write.
------ Solution --------------------

PHP code

/* For the main application, some TCP socket information is obtained here */$ status = stream_get_meta_data ($ fp ); /* check whether the TCP connection times out */if (! $ Status ['timed _ out']) {/* if no timeout occurs, read the data until the file terminator */while (! Feof ($ fp) {/* because the HTTP header information is read here, the empty line header information ends, therefore, you need break */if ($ header = @ fgets ($ fp )) & ($ header = "\ r \ n" | $ header = "\ n") {break ;}/ * read the HTTP body, I personally think the processing here is a bit rough. at least first check whether the Content-Length in the HTTP response header is processed according to it. if it is not read as follows */$ stop = false; while (! Feof ($ fp )&&! $ Stop) {/* read a maximum of 8192 bytes ($ limit decreasing) */$ data = fread ($ fp, ($ limit = 0 | $ limit> 8192? 8192: $ limit);/* connect the read content to the returned string */$ return. = $ data; if ($ limit) {$ limit-= strlen ($ data); $ stop = $ limit <= 0 ;}}}
------ Solution --------------------