socket_recv Receives data from a connected socket &reftitle.description; intsocket_recv resourcesocket stringbuf intlen intflags The socket_recv function receives len bytes of data in buf from socket. socket_recv can be used to gather data from connected sockets. Additionally, one or more flags can be specified to modify the behaviour of the function. buf is passed by reference, so it must be specified as a variable in the argument list. Data read from socket by socket_recv will be returned in buf. &reftitle.parameters; socket The socket must be a socket resource previously created by socket_create(). buf The data received will be fetched to the variable specified with buf. If an error occurs, if the connection is reset, or if no data is available, buf will be set to &null;. len Up to len bytes will be fetched from remote host. flags The value of flags can be any combination of the following flags, joined with the binary OR (|) operator. Flag Description MSG_OOB Process out-of-band data. MSG_PEEK Receive data from the beginning of the receive queue without removing it from the queue. MSG_WAITALL Block until at least len are received. However, if a signal is caught or the remote host disconnects, the function may return less data. MSG_DONTWAIT With this flag set, the function returns even if it would normally have blocked. &reftitle.returnvalues; socket_recv returns the number of bytes received, or &false; if there was an error. The actual error code can be retrieved by calling socket_last_error. This error code may be passed to socket_strerror to get a textual explanation of the error. &reftitle.examples; This example is a simple rewrite of the first example from to use socket_recv. TCP/IP Connection\n"; /* Get the port for the WWW service. */ $service_port = getservbyname('www', 'tcp'); /* Get the IP address for the target host. */ $address = gethostbyname('www.example.com'); /* Create a TCP/IP socket. */ $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; } else { echo "OK.\n"; } echo "Attempting to connect to '$address' on port '$service_port'..."; $result = socket_connect($socket, $address, $service_port); if ($result === false) { echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socket_last_error($socket)) . "\n"; } else { echo "OK.\n"; } $in = "HEAD / HTTP/1.1\r\n"; $in .= "Host: www.example.com\r\n"; $in .= "Connection: Close\r\n\r\n"; $out = ''; echo "Sending HTTP HEAD request..."; socket_write($socket, $in, strlen($in)); echo "OK.\n"; echo "Reading response:\n\n"; $buf = 'This is my buffer.'; if (false !== ($bytes = socket_recv($socket, $buf, 2048, MSG_WAITALL))) { echo "Read $bytes bytes from socket_recv(). Closing socket..."; } else { echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($socket)) . "\n"; } socket_close($socket); echo $buf . "\n"; echo "OK.\n\n"; ?> ]]> The above example will produce something like: TCP/IP Connection OK. Attempting to connect to '208.77.188.166' on port '80'...OK. Sending HTTP HEAD request...OK. Reading response: Read 123 bytes from socket_recv(). Closing socket...HTTP/1.1 200 OK Date: Mon, 14 Sep 2009 08:56:36 GMT Server: Apache/2.2.3 (Red Hat) Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT ETag: "b80f4-1b6-80bfd280" Accept-Ranges: bytes Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8 OK. ]]>