+ */
+class Net_Socket extends PEAR {
+
+ /**
+ * Socket file pointer.
+ * @var resource $fp
+ */
+ var $fp = null;
+
+ /**
+ * Whether the socket is blocking. Defaults to true.
+ * @var boolean $blocking
+ */
+ var $blocking = true;
+
+ /**
+ * Whether the socket is persistent. Defaults to false.
+ * @var boolean $persistent
+ */
+ var $persistent = false;
+
+ /**
+ * The IP address to connect to.
+ * @var string $addr
+ */
+ var $addr = '';
+
+ /**
+ * The port number to connect to.
+ * @var integer $port
+ */
+ var $port = 0;
+
+ /**
+ * Number of seconds to wait on socket connections before assuming
+ * there's no more data. Defaults to no timeout.
+ * @var integer $timeout
+ */
+ var $timeout = false;
+
+ /**
+ * Number of bytes to read at a time in readLine() and
+ * readAll(). Defaults to 2048.
+ * @var integer $lineLength
+ */
+ var $lineLength = 2048;
+
+ /**
+ * Connect to the specified port. If called when the socket is
+ * already connected, it disconnects and connects again.
+ *
+ * @param string $addr IP address or host name.
+ * @param integer $port TCP port number.
+ * @param boolean $persistent (optional) Whether the connection is
+ * persistent (kept open between requests
+ * by the web server).
+ * @param integer $timeout (optional) How long to wait for data.
+ * @param array $options See options for stream_context_create.
+ *
+ * @access public
+ *
+ * @return boolean | PEAR_Error True on success or a PEAR_Error on failure.
+ */
+ function connect($addr, $port = 0, $persistent = null, $timeout = null, $options = null)
+ {
+ if (is_resource($this->fp)) {
+ @fclose($this->fp);
+ $this->fp = null;
+ }
+
+ if (!$addr) {
+ return $this->raiseError('$addr cannot be empty');
+ } elseif (strspn($addr, '.0123456789') == strlen($addr) ||
+ strstr($addr, '/') !== false) {
+ $this->addr = $addr;
+ } else {
+ $this->addr = @gethostbyname($addr);
+ }
+
+ $this->port = $port % 65536;
+
+ if ($persistent !== null) {
+ $this->persistent = $persistent;
+ }
+
+ if ($timeout !== null) {
+ $this->timeout = $timeout;
+ }
+
+ $openfunc = $this->persistent ? 'pfsockopen' : 'fsockopen';
+ $errno = 0;
+ $errstr = '';
+ if ($options && function_exists('stream_context_create')) {
+ if ($this->timeout) {
+ $timeout = $this->timeout;
+ } else {
+ $timeout = 0;
+ }
+ $context = stream_context_create($options);
+ $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $timeout, $context);
+ } else {
+ if ($this->timeout) {
+ $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $this->timeout);
+ } else {
+ $fp = @$openfunc($this->addr, $this->port, $errno, $errstr);
+ }
+ }
+
+ if (!$fp) {
+ return $this->raiseError($errstr, $errno);
+ }
+
+ $this->fp = $fp;
+
+ return $this->setBlocking($this->blocking);
+ }
+
+ /**
+ * Disconnects from the peer, closes the socket.
+ *
+ * @access public
+ * @return mixed true on success or an error object otherwise
+ */
+ function disconnect()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ @fclose($this->fp);
+ $this->fp = null;
+ return true;
+ }
+
+ /**
+ * Find out if the socket is in blocking mode.
+ *
+ * @access public
+ * @return boolean The current blocking mode.
+ */
+ function isBlocking()
+ {
+ return $this->blocking;
+ }
+
+ /**
+ * Sets whether the socket connection should be blocking or
+ * not. A read call to a non-blocking socket will return immediately
+ * if there is no data available, whereas it will block until there
+ * is data for blocking sockets.
+ *
+ * @param boolean $mode True for blocking sockets, false for nonblocking.
+ * @access public
+ * @return mixed true on success or an error object otherwise
+ */
+ function setBlocking($mode)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $this->blocking = $mode;
+ socket_set_blocking($this->fp, $this->blocking);
+ return true;
+ }
+
+ /**
+ * Sets the timeout value on socket descriptor,
+ * expressed in the sum of seconds and microseconds
+ *
+ * @param integer $seconds Seconds.
+ * @param integer $microseconds Microseconds.
+ * @access public
+ * @return mixed true on success or an error object otherwise
+ */
+ function setTimeout($seconds, $microseconds)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return socket_set_timeout($this->fp, $seconds, $microseconds);
+ }
+
+ /**
+ * Returns information about an existing socket resource.
+ * Currently returns four entries in the result array:
+ *
+ *
+ * timed_out (bool) - The socket timed out waiting for data
+ * blocked (bool) - The socket was blocked
+ * eof (bool) - Indicates EOF event
+ * unread_bytes (int) - Number of bytes left in the socket buffer
+ *
+ *
+ * @access public
+ * @return mixed Array containing information about existing socket resource or an error object otherwise
+ */
+ function getStatus()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return socket_get_status($this->fp);
+ }
+
+ /**
+ * Get a specified line of data
+ *
+ * @access public
+ * @return $size bytes of data from the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function gets($size)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return @fgets($this->fp, $size);
+ }
+
+ /**
+ * Read a specified amount of data. This is guaranteed to return,
+ * and has the added benefit of getting everything in one fread()
+ * chunk; if you know the size of the data you're getting
+ * beforehand, this is definitely the way to go.
+ *
+ * @param integer $size The number of bytes to read from the socket.
+ * @access public
+ * @return $size bytes of data from the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function read($size)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return @fread($this->fp, $size);
+ }
+
+ /**
+ * Write a specified amount of data.
+ *
+ * @param string $data Data to write.
+ * @param integer $blocksize Amount of data to write at once.
+ * NULL means all at once.
+ *
+ * @access public
+ * @return mixed true on success or an error object otherwise
+ */
+ function write($data, $blocksize = null)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ if (is_null($blocksize) && !OS_WINDOWS) {
+ return fwrite($this->fp, $data);
+ } else {
+ if (is_null($blocksize)) {
+ $blocksize = 1024;
+ }
+
+ $pos = 0;
+ $size = strlen($data);
+ while ($pos < $size) {
+ $written = @fwrite($this->fp, substr($data, $pos, $blocksize));
+ if ($written === false) {
+ return false;
+ }
+ $pos += $written;
+ }
+
+ return $pos;
+ }
+ }
+
+ /**
+ * Write a line of data to the socket, followed by a trailing "\r\n".
+ *
+ * @access public
+ * @return mixed fputs result, or an error
+ */
+ function writeLine($data)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return fwrite($this->fp, $data . "\r\n");
+ }
+
+ /**
+ * Tests for end-of-file on a socket descriptor.
+ *
+ * @access public
+ * @return bool
+ */
+ function eof()
+ {
+ return (is_resource($this->fp) && feof($this->fp));
+ }
+
+ /**
+ * Reads a byte of data
+ *
+ * @access public
+ * @return 1 byte of data from the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function readByte()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ return ord(@fread($this->fp, 1));
+ }
+
+ /**
+ * Reads a word of data
+ *
+ * @access public
+ * @return 1 word of data from the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function readWord()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $buf = @fread($this->fp, 2);
+ return (ord($buf[0]) + (ord($buf[1]) << 8));
+ }
+
+ /**
+ * Reads an int of data
+ *
+ * @access public
+ * @return integer 1 int of data from the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function readInt()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $buf = @fread($this->fp, 4);
+ return (ord($buf[0]) + (ord($buf[1]) << 8) +
+ (ord($buf[2]) << 16) + (ord($buf[3]) << 24));
+ }
+
+ /**
+ * Reads a zero-terminated string of data
+ *
+ * @access public
+ * @return string, or a PEAR_Error if
+ * not connected.
+ */
+ function readString()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $string = '';
+ while (($char = @fread($this->fp, 1)) != "\x00") {
+ $string .= $char;
+ }
+ return $string;
+ }
+
+ /**
+ * Reads an IP Address and returns it in a dot formated string
+ *
+ * @access public
+ * @return Dot formated string, or a PEAR_Error if
+ * not connected.
+ */
+ function readIPAddress()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $buf = @fread($this->fp, 4);
+ return sprintf("%s.%s.%s.%s", ord($buf[0]), ord($buf[1]),
+ ord($buf[2]), ord($buf[3]));
+ }
+
+ /**
+ * Read until either the end of the socket or a newline, whichever
+ * comes first. Strips the trailing newline from the returned data.
+ *
+ * @access public
+ * @return All available data up to a newline, without that
+ * newline, or until the end of the socket, or a PEAR_Error if
+ * not connected.
+ */
+ function readLine()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $line = '';
+ $timeout = time() + $this->timeout;
+ while (!feof($this->fp) && (!$this->timeout || time() < $timeout)) {
+ $line .= @fgets($this->fp, $this->lineLength);
+ if (substr($line, -1) == "\n") {
+ return rtrim($line, "\r\n");
+ }
+ }
+ return $line;
+ }
+
+ /**
+ * Read until the socket closes, or until there is no more data in
+ * the inner PHP buffer. If the inner buffer is empty, in blocking
+ * mode we wait for at least 1 byte of data. Therefore, in
+ * blocking mode, if there is no data at all to be read, this
+ * function will never exit (unless the socket is closed on the
+ * remote end).
+ *
+ * @access public
+ *
+ * @return string All data until the socket closes, or a PEAR_Error if
+ * not connected.
+ */
+ function readAll()
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $data = '';
+ while (!feof($this->fp)) {
+ $data .= @fread($this->fp, $this->lineLength);
+ }
+ return $data;
+ }
+
+ /**
+ * Runs the equivalent of the select() system call on the socket
+ * with a timeout specified by tv_sec and tv_usec.
+ *
+ * @param integer $state Which of read/write/error to check for.
+ * @param integer $tv_sec Number of seconds for timeout.
+ * @param integer $tv_usec Number of microseconds for timeout.
+ *
+ * @access public
+ * @return False if select fails, integer describing which of read/write/error
+ * are ready, or PEAR_Error if not connected.
+ */
+ function select($state, $tv_sec, $tv_usec = 0)
+ {
+ if (!is_resource($this->fp)) {
+ return $this->raiseError('not connected');
+ }
+
+ $read = null;
+ $write = null;
+ $except = null;
+ if ($state & NET_SOCKET_READ) {
+ $read[] = $this->fp;
+ }
+ if ($state & NET_SOCKET_WRITE) {
+ $write[] = $this->fp;
+ }
+ if ($state & NET_SOCKET_ERROR) {
+ $except[] = $this->fp;
+ }
+ if (false === ($sr = stream_select($read, $write, $except, $tv_sec, $tv_usec))) {
+ return false;
+ }
+
+ $result = 0;
+ if (count($read)) {
+ $result |= NET_SOCKET_READ;
+ }
+ if (count($write)) {
+ $result |= NET_SOCKET_WRITE;
+ }
+ if (count($except)) {
+ $result |= NET_SOCKET_ERROR;
+ }
+ return $result;
+ }
+
+}