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

From: Date: Tue, 17 Jul 2007 18:58:24 +0000
Subject: #42020 [Opn]: curl_multi_select causes php to fail, silently
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-115149@lists.php.net to get a copy of this message
 ID:               42020
 User updated by:  adz999 at yahoo dot co dot uk
 Reported By:      adz999 at yahoo dot co dot uk
 Status:           Open
 Bug Type:         cURL related
 Operating System: Free BSD (i386)
 PHP Version:      5.2.3
 New Comment:

Some of my submission did not post properly:

The "Reproduce code" section should have this at the end:
print "4<br>";

The "Expected result" section should continue:
...to loop around again, and therefore print out "2<br" again.
Or if curl_multi_select($mh) was NOT equal to -1 then I would expect
php to print out "3<br>" regardless of whether it then went on to
execute curl_multi_exec.


Previous Comments:
------------------------------------------------------------------------

[2007-07-17 18:47:26] adz999 at yahoo dot co dot uk

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


------------------------------------------------------------------------


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Edit this bug report at http://bugs.php.net/?id=42020&edit=1


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