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16 years ago
Here is an example of a non-blocking connect which should perform quite a bit faster than the one posted by Seymour below:



<?php

function msConnectSocket($remote, $port, $timeout = 30) {

        # this works whether $remote is a hostname or IP

        $ip = "";

        if( !preg_match('/^\d+\.\d+\.\d+\.\d+$/', $remote) ) {

            $ip = gethostbyname($remote);

            if ($ip == $remote) {

                $this->errstr = "Error Connecting Socket: Unknown host";

                return NULL;

            }

        } else $ip = $remote;



        if (!($this->_SOCK = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) {

            $this->errstr = "Error Creating Socket: ".socket_strerror(socket_last_error());

            return NULL;

        }



        socket_set_nonblock($this->_SOCK);



        $error = NULL;

        $attempts = 0;

        $timeout *= 1000;  // adjust because we sleeping in 1 millisecond increments

        $connected;

        while (!($connected = @socket_connect($this->_SOCK, $remote, $port+0)) && $attempts++ < $timeout) {

            $error = socket_last_error();

            if ($error != SOCKET_EINPROGRESS && $error != SOCKET_EALREADY) {

                $this->errstr = "Error Connecting Socket: ".socket_strerror($error);

                socket_close($this->_SOCK);

                return NULL;

            }

            usleep(1000);

        }



        if (!$connected) {

            $this->errstr = "Error Connecting Socket: Connect Timed Out After $timeout seconds. ".socket_strerror(socket_last_error());

            socket_close($this->_SOCK);

            return NULL;

        }

        

        socket_set_block($this->_SOCK);



        return 1;      

}

?>
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