#42020 [NEW]: curl_multi_select causes php to fail, silently

From: adz999 at yahoo dot co dot uk Operating system: Free BSD (i386) PHP version: 5.2.3 PHP Bug Type: cURL related Bug description: curl_multi_select causes php to fail, silently Description: ------------ I am using (a slight variation of) the user-contributed example on this page:http://uk2.php.net/manual/en/function.curl-multi-exec.php. Sometimes it works and sometimes it causes php to fail, without displaying any error notice (error reporting set to E_WARNING). I cannot work out what it is that causes it to fail or not fail, but if I run the same requests on the script multiple times it behaves the same every time. By getting php to print a message between each line of code I have narrowed the problem down to this line: if (curl_multi_select($mh) != -1) This is the php info for the server: http://phpinfo.hostultra.com/ The problem does NOT occur when the script is executed on my local testing server (Mac OS X 10.4.8, PHP 5.2.1). Reproduce code: --------------- <?php $mh = curl_multi_init(); foreach(array_keys($arr_requests) as $i) curl_multi_add_handle ($mh,$arr_requests[$i]); //each element of $arr_requests is a curl handle print "got as far as executing the curl stuff<br>"; while (@ob_end_flush()); while (@flush()); do { $mrc = curl_multi_exec($mh, $active); } while ($mrc == CURLM_CALL_MULTI_PERFORM && $active>0 && microtime(1)<$time); print "1<br>"; while (@ob_end_flush()); while (@flush()); while ($active>0 and $mrc == CURLM_OK && microtime(1)<$time){ print "2<br>"; while (@ob_end_flush()); while (@flush()); //this gets printed out fine // wait for network if (curl_multi_select($mh) != -1){ // pull in any new data, or at least handle timeouts do { print "3<br>"; while (@ob_end_flush()); while (@flush()); //php never gets this far $mrc = curl_multi_exec($mh, $active); } while ($mrc == CURLM_CALL_MULTI_PERFORM && $active>0 && microtime(1)<$time); } }//end while Expected result: ---------------- If curl_multi_select($mh) was equal to -1 then I would expect the while loop while ($active>0 and $mrc == CURLM_OK && microtime(1)<$time) Actual result: -------------- PHP outputs: got as far as executing the curl stuff 1 2 ...and then it stops. The connection to the browser is no longer active. That's it, it just stops there and does no more. No error message. Even if I change the line if (curl_multi_select($mh) != -1) to just if (curl_multi_select($mh)) the result is exactly the same -- Edit bug report at http://bugs.php.net/?id=42020&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=42020&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=42020&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=42020&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=42020&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=42020&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=42020&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=42020&r=needscript Try newer version: http://bugs.php.net/fix.php?id=42020&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=42020&r=support Expected behavior: http://bugs.php.net/fix.php?id=42020&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=42020&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=42020&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=42020&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=42020&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=42020&r=dst IIS Stability: http://bugs.php.net/fix.php?id=42020&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=42020&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=42020&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=42020&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=42020&r=mysqlcfg