socket_select() problem

Hi, I have a problem with socket_select(). I hope someone here can point me in the right direction, because I'm stumped. Basically, I'm getting this error: Warning: socket_select() [function.socket-select]: no resource arrays were passed to select in Net/Gearman/Client.php on line 197 This is using the Net_Gearman PEAR package to submit a Gearman job. The job is submitted and runs to completion; this message is displayed by the caller. The relevant code is here: http://code.google.com/p/netgearman/source/browse/trunk/Net/Gearman/Client.php#197

            $write  = null;
            $except = null;
            $read   = $this->conn;
            socket_select($read, $write, $except, 10);

If I add var_dump($read) on the line above socket_select(), I get: array(2) { [0]=> resource(141) of type (Socket) [1]=> resource(142) of type (Socket) } The error message appears to be spurious. This is where the socket is created:

            $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
            @socket_connect($socket, $host, $port);
            $errorCode = socket_last_error($socket);

            socket_set_nonblock($socket);
            socket_set_option($socket, SOL_TCP, 1, 1);

I removed the @, and there were no errors being hidden. I resorted to examining the socket extension code, and these are my findings: socket_select() calls php_sock_array_to_fd_set() on $read / $write / $except: http://cvs.php.net/viewvc.cgi/php-src/ext/sockets/sockets.c?revision=1.199&view=markup#l788 If the result of all three of those operations is zero, the error message is displayed. php_sock_array_to_fd_set() checks to see if the argument it got is an array: http://cvs.php.net/viewvc.cgi/php-src/ext/sockets/sockets.c?revision=1.199&view=markup#l710 If not, it returns zero. php_sock_array_to_fd_set() calls zend_fetch_resource(): http://cvs.php.net/viewvc.cgi/php-src/ext/sockets/sockets.c?revision=1.199&view=markup#l716 If that returns zero for every element in the array, php_sock_array_to_fd_set() also returns zero. Since I'm dumping $read directly before the socket_select() call, it seems that the zend_fetch_resource() call is what's failing. I wrote a simple testcase that submits a single job to Gearman. If I run it under Apache2, I get the socket_select() warning. If I run it from the CLI, I don't. I'm also pointing the CLI at the Apache2 php.ini file. At this point, I don't know how to track this any further. If I was getting the same error on the CLI, I could trace it with gdb. I don't know how I'd go about doing something like that for an Apache extension. I'm running PHP 5.2.0 under Debian Etch, installed from the vanilla Debian packages (5.2.0-8+etch1). I have APC and Memcache extensions installed from PECL. I disabled both, and there was no change in what I'm seeing. I also emailed everyone listed in socket.c, but I got no response. I'm at a loss. Where do I go from here? - Ian