PHP/Network/socket create

Creating a Simple Socket-Based Server

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<?php

   set_time_limit(0);
   $address = "127.0.0.1";
   $port = 4545;
   $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
   socket_bind($socket, $address, $port);
   socket_listen($socket);
   $connection = socket_accept($socket);
   $result = trim(socket_read($connection, 1024));
   echo "Result received: "$result"\n";
   socket_close($connection);
   socket_shutdown($socket);
   socket_close($socket);

?>

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Domain Constants for Socket Connections

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AF_INET Internet (IPv4) protocols

AF_INET6 Internet (IPv6) protocols

AF_UNIX Local interprocess communication

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Retrieving a Website Using Sockets

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<?php

   $address = "127.0.0.1";
   $port = 80;
   $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
   socket_connect($socket, $address, $port);
   socket_write($socket, "GET /index.php HTTP/1.0\n\n");
   $result = "";
   while($read = socket_read($socket, 1024)) {
       $result .= $read;
   }
   echo "Result received: "$result"\n";
   socket_close($socket);

?>

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Socket Type Constants

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SOCK_STREAM A sequenced and reliable bidirectional connection-based stream. Most common in use.

SOCK_DGRAM An unreliable, connectionless socket that transmits data of a fixed length. Very good for streaming of data where reliability is not a concern.

SOCK_SEQPACKET Similar to stream sockets, except data is transmitted and received in fixed-length packets.

SOCK_RAW A raw socket connection, useful for performing ICMP (Internet Control Message Protocol) operations such as traces, pings, and so on.

SOCK_RDM A reliable but unsequenced socket similar to that of SOCK_DGRAM.

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