note 108928 added to function.curl-multi-select

curl_multi_select($mh, $timeout) simply blocks for $timeout seconds while curl_multi_exec() returns CURLM_CALL_MULTI_PERFORM. Otherwise, it works as intended, and blocks until at least one connection has completed or $timeout seconds, whatever happens first. For that reason, curl_multi_exec() should always be wrapped: function full_curl_multi_exec($mh, &$still_running) { do { $rv = curl_multi_exec($mh, $still_running); } while ($rv == CURLM_CALL_MULTI_PERFORM); return $rv; } With that, the core of "multi" processing becomes (ignoring error handling for brevity): full_curl_multi_exec($mh, $still_running); // start requests do { // "wait for completion"-loop curl_multi_select($mh); // non-busy (!) wait for state change full_curl_multi_exec($mh, $still_running); // get new state while ($info = curl_multi_info_read($mh)) { // process completed request (e.g. curl_multi_getcontent($info['handle'])) } } while ($still_running); Note that after starting requests, retrieval is done in the background - one of the better shots at parallel processing in PHP. ---- Server IP: 87.106.1.137 Probable Submitter: 217.7.231.86 ---- Manual Page -- http://www.php.net/manual/en/function.curl-multi-select.php Edit -- https://master.php.net/note/edit/108928 Del: integrated -- https://master.php.net/note/delete/108928/integrated Del: useless -- https://master.php.net/note/delete/108928/useless Del: bad code -- https://master.php.net/note/delete/108928/bad+code Del: spam -- https://master.php.net/note/delete/108928/spam Del: non-english -- https://master.php.net/note/delete/108928/non-english Del: in docs -- https://master.php.net/note/delete/108928/in+docs Del: other reasons-- https://master.php.net/note/delete/108928 Reject -- https://master.php.net/note/reject/108928 Search -- https://master.php.net/manage/user-notes.php