How to implement multi-thread collection in stream mode?

Multi-thread collection in stream mode. please analyze the slow speed of the collected content. I have been very busy. recently I have been studying multi-thread collection. below I have posted a comparison code. There are two problems, first, the length of the obtained results is a bit inconsistent; second, is the efficiency not high enough? Help analysis and test! PHPcode & lt ;? Php $ timeStart = multi-thread collection in the microt stream mode.
The collection speed is slow, and I have been very large. recently I have been studying multi-threaded collection. The following is a comparison code. There are two problems: first, the length of the obtained results is a bit inconsistent; 2. is efficiency not high enough? Help analysis and test!

PHP code

  
  ';}$timeEnd = microtimeFloat();echo sprintf("Spend time: %s second(s)\n", $timeEnd - $timeStart),'
';$timeStart = microtimeFloat();$timeout = 30;$status = array();$retdata = array();$sockets = array();$userAgent = $_SERVER['HTTP_USER_AGENT'];foreach($urls as $id => $url) {    $tmp = parse_url($url);    $host = $tmp['host'];    $path = isset($tmp['path'])?$tmp['path']:'/';    empty($tmp['query']) or $path .= '?' . $tmp['query'];    if (empty($tmp['port'])) {        $port = $tmp['scheme'] == 'https' ? 443 : 80;    } else $port = $tmp['port'];    $fp = stream_socket_client("$host:$port", $errno, $errstr, 30);    if (!$fp) {        $status[$id] = "failed, $errno $errstr";    } else {        $status[$id] = "in progress";        $retdata[$id] = '';        $sockets[$id] = $fp;        fwrite($fp, "GET $path HTTP/1.1\r\nHost: $host\r\nUser-Agent: $userAgent\r\nConnection: Close\r\n\r\n");    }}// Now, wait for the results to come back inwhile (count($sockets)) {    $read = $write = $sockets;    //This is the magic function - explained below    if (stream_select($read, $write = null, $e = null, $timeout)) {        //readable sockets either have data for us, or are failed connection attempts        foreach ($read as $r) {            $id = array_search($r, $sockets);            $data = fread($r, 8192);            if (strlen($data) == 0) {                if ($status[$id] == "in progress") {                    $status[$id] = "failed to connect";                }                fclose($r);                unset($sockets[$id]);            } else {                $retdata[$id] .= $data;            }        }    }}foreach($retdata as $data){    $data = trim(substr($data, strpos($data, "\r\n\r\n") + 4));    echo strlen($data),'
';}$timeEnd = microtimeFloat();echo sprintf("Spend time: %s second(s)\n", $timeEnd - $timeStart);?>

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You can try curl_multi _... concurrent execution
This can minimize the number of php commands. Php cannot solve this problem.

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Of course, file_get_contents () is of the blocking type, so if you execute multiple capture tasks, of course, it will be slow.
Socket _ * (), fsockopen (), stream _ * () are not blocked.
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To what extent?

Try to add this:

$ Context = stream_context_create (array ('http '=> array ('header' => 'connection: close ')));
File_get_contents ("...", false, $ context );