求解：PHP socket 的问题

<?php //Reduce errorserror_reporting(~E_WARNING); //Create a UDP socketif(!($sock = socket_create(AF_INET, SOCK_DGRAM, 0))){    $errorcode = socket_last_error();    $errormsg = socket_strerror($errorcode);         die("Couldn't create socket: [$errorcode] $errormsg \n");} echo "Socket created \n"; // Bind the source addressif( !socket_bind($sock, "localhost" , 9999) ){    $errorcode = socket_last_error();    $errormsg = socket_strerror($errorcode);         die("Could not bind socket : [$errorcode] $errormsg \n");} echo "Socket bind OK \n"; //Do some communication, this loop can handle multiple clientswhile(1){    echo "Waiting for data ... \n";         //Receive some data    $r = socket_recvfrom($sock, $buf, 512, 0, $remote_ip, $remote_port);    echo "$remote_ip : $remote_port -- " . $buf;         //Send back the data to the client    socket_sendto($sock, "OK " . $buf , 100 , 0 , $remote_ip , $remote_port);} socket_close($sock);?>

Configure Command	 './configure' '--prefix=/usr/local/php5' '--enable-force-cgi-redirect' '--enable-fastcgi' '--with-config-file-path=/usr/local/etc/php5/cgi' '--with-curl=/usr/local/lib' '--with-gd' '--with-gettext' '--with-jpeg-dir=/usr/local/lib' '--with-freetype-dir=/usr/local/lib' '--with-kerberos' '--with-openssl' '--with-mcrypt' '--with-mhash' '--with-mysql=/usr' '--with-mysqli=/usr/bin/mysql_config' '--with-pcre-regex=/usr/local' '--with-pdo-mysql=/usr' '--with-pear' '--with-png-dir=/usr/local/lib' '--with-xsl' '--with-zlib' '--with-zlib-dir=/usr/local/lib' '--enable-zip' '--enable-gd-native-ttf' '--with-iconv=/usr/local' '--enable-bcmath' '--enable-calendar' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets' '--enable-mbstring'

Registered Stream Socket Transports	tcp, udp, unix, udg, ssl, sslv3, sslv2, tls

socketsSockets Support	enabled

default_socket_timeout	60	60

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