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Socket Functions


The socket extension implements a low-level interface to the socket communication functions based on the popular BSD sockets, providing the possibility to act as a socket server as well as a client.

For a more generic client-side socket interface, see stream_socket_client(), stream_socket_server(), fsockopen(), and pfsockopen().

When using these functions, it is important to remember that while many of them have identical names to their C counterparts, they often have different declarations. Please be sure to read the descriptions to avoid confusion.

Those unfamiliar with socket programming can find a lot of useful material in the appropriate Unix man pages, and there is a great deal of tutorial information on socket programming in C on the web, much of which can be applied, with slight modifications, to socket programming in PHP. The » Unix Socket FAQ might be a good start.

Notă: Această extensie a fost transferată în repozitoriul » PECL şi nu mai este furnizată împreună cu PHP începând cu versiunea 5.3.0.


Nu sunt necesare biblioteci externe pentru a asambla această extensie.


The socket functions described here are part of an extension to PHP which must be enabled at compile time by giving the --enable-sockets option to configure.

Notă: Susţinerea IPv6 a fost adăugată în PHP 5.0.0.

Configuraţia la rulare

Această extensie nu are directive de configurare definite în php.ini.

Tipurile resurselor

socket_accept(), socket_create_listen() and socket_create() return socket recources.

Constante predefinite

Constantele de mai jos sunt definite de această extensie şi vor fi disponibile doar dacă această extensie a fost compilată în interiorul PHP, sau a fost încărcată dinamic în timpul rulării.

AF_UNIX (integer)
AF_INET (integer)
AF_INET6 (integer)
SOCK_STREAM (integer)
SOCK_DGRAM (integer)
SOCK_RAW (integer)
SOCK_RDM (integer)
MSG_OOB (integer)
MSG_WAITALL (integer)
MSG_PEEK (integer)
MSG_EOR (integer)
MSG_EOF (integer)
SO_DEBUG (integer)
SO_REUSEADDR (integer)
SO_KEEPALIVE (integer)
SO_DONTROUTE (integer)
SO_LINGER (integer)
SO_BROADCAST (integer)
SO_OOBINLINE (integer)
SO_SNDBUF (integer)
SO_RCVBUF (integer)
SO_SNDLOWAT (integer)
SO_RCVLOWAT (integer)
SO_SNDTIMEO (integer)
SO_RCVTIMEO (integer)
SO_TYPE (integer)
SO_ERROR (integer)
SOL_SOCKET (integer)
SOL_TCP (integer)
SOL_UDP (integer)

Socket Errors

The socket extension was written to provide a usable interface to the powerful BSD sockets. Care has been taken that the functions work equally well on Win32 and Unix implementations. Almost all of the sockets functions may fail under certain conditions and therefore emit an E_WARNING message describing the error. Sometimes this doesn't happen to the desire of the developer. For example the function socket_read() may suddenly emit an E_WARNING message because the connection broke unexpectedly. It's common to suppress the warning with the @-operator and catch the error code within the application with the socket_last_error() function. You may call the socket_strerror() function with this error code to retrieve a string describing the error. See their description for more information.

Notă: The E_WARNING messages generated by the socket extension are in English though the retrieved error message will appear depending on the current locale (LC_MESSAGES):

Warning - socket_bind() unable to bind address [98]: Die Adresse wird bereits verwendet


Example#1 Socket example: Simple TCP/IP server

This example shows a simple talkback server. Change the address and port variables to suit your setup and execute. You may then connect to the server with a command similar to: telnet 10000 (where the address and port match your setup). Anything you type will then be output on the server side, and echoed back to you. To disconnect, enter 'quit'.

#!/usr/local/bin/php -q

/* Allow the script to hang around waiting for connections. */

/* Turn on implicit output flushing so we see what we're getting
 * as it comes in. */

$address '';
$port 10000;

if ((
$sock socket_create(AF_INETSOCK_STREAMSOL_TCP)) === false) {
"socket_create() failed: reason: " socket_strerror(socket_last_error()) . "\n";

if (
socket_bind($sock$address$port) === false) {
"socket_bind() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";

if (
socket_listen($sock5) === false) {
"socket_listen() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";

do {
    if ((
$msgsock socket_accept($sock)) === false) {
"socket_accept() failed: reason: " socket_strerror(socket_last_error($sock)) . "\n";
/* Send instructions. */
$msg "\nWelcome to the PHP Test Server. \n" .
"To quit, type 'quit'. To shut down the server type 'shutdown'.\n";

    do {
        if (
false === ($buf socket_read($msgsock2048PHP_NORMAL_READ))) {
"socket_read() failed: reason: " socket_strerror(socket_last_error($msgsock)) . "\n";
        if (!
$buf trim($buf)) {
        if (
$buf == 'quit'