Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

AF_UNIX (integer)
AF_INET (integer)
AF_INET6 (integer): Only available if compiled with IPv6 support.
SOCK_STREAM (integer)
SOCK_DGRAM (integer)
SOCK_RAW (integer)
SOCK_SEQPACKET (integer)
SOCK_RDM (integer)
MSG_OOB (integer)
MSG_WAITALL (integer)
MSG_PEEK (integer)
MSG_DONTROUTE (integer)
MSG_EOR (integer): Not available on Windows platforms.
MSG_EOF (integer): Not available on Windows platforms.
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)
TCP_NODELAY (integer): Used to disable Nagle TCP algorithm. Added in PHP 5.2.7.
SOL_SOCKET (integer)
PHP_NORMAL_READ (integer)
PHP_BINARY_READ (integer)
SOL_TCP (integer)
SOL_UDP (integer)

The following constants are defined under Windows and UNIX-like platforms. Each constant is only defined if their equal is available on the platform.

SOCKET_EINTR (integer): Interrupted system call.
SOCKET_EBADF (integer): Bad file number.
SOCKET_EACCES (integer): Permission denied.
SOCKET_EFAULT (integer): Bad address.
SOCKET_EINVAL (integer): Invalid argument.
SOCKET_EMFILE (integer): Too many open files.
SOCKET_ENAMETOOLONG (integer): File name too long.
SOCKET_ENOTEMPTY (integer): Directory not empty.
SOCKET_ELOOP (integer): Too many symbolic links encountered.
SOCKET_EWOULDBLOCK (integer): Operation would block.
SOCKET_EREMOTE (integer): Object is remote.
SOCKET_EUSERS (integer): Too many users.
SOCKET_ENOTSOCK (integer): Socket operation on non-socket.
SOCKET_EDESTADDRREQ (integer): Destination address required.
SOCKET_EMSGSIZE (integer): Message too long.
SOCKET_EPROTOTYPE (integer): Protocol wrong type for socket.
SOCKET_EPROTONOSUPPORT (integer): Protocol not supported.
SOCKET_ESOCKTNOSUPPORT (integer): Socket type not supported.
SOCKET_EOPNOTSUPP (integer): Operation not supported on transport endpoint.
SOCKET_EPFNOSUPPORT (integer): Protocol family not supported.
SOCKET_EAFNOSUPPORT (integer): Address family not supported by protocol.
SOCKET_EADDRNOTAVAIL (integer): Cannot assign requested address.
SOCKET_ENETDOWN (integer): Network is down.
SOCKET_ENETUNREACH (integer): Network is unreachable.
SOCKET_ENETRESET (integer): Network dropped connection because of reset.
SOCKET_ECONNABORTED (integer): Software caused connection abort.
SOCKET_ECONNRESET (integer): Connection reset by peer.
SOCKET_ENOBUFS (integer): No buffer space available.
SOCKET_EISCONN (integer): Transport endpoint is already connected.
SOCKET_ENOTCONN (integer): Transport endpoint is not connected.
SOCKET_ESHUTDOWN (integer): Cannot send after transport endpoint shutdown.
SOCKET_ETIMEDOUT (integer): Connection timed out.
SOCKET_ECONNREFUSED (integer): Connection refused.
SOCKET_EHOSTDOWN (integer): Host is down.
SOCKET_EHOSTUNREACH (integer): No route to host.
SOCKET_EALREADY (integer): Operation already in progress.
SOCKET_EINPROGRESS (integer): Operation now in progress.

The following constants are only defined under Windows.

SOCKET_ENOPROTOOPT (integer)
SOCKET_EADDRINUSE (integer)
SOCKET_ETOOMYREFS (integer)
SOCKET_EPROCLIM (integer)
SOCKET_EDUOT (integer)
SOCKET_ESTALE (integer)
SOCKET_EDISCON (integer)
SOCKET_SYSNOTREADY (integer)
SOCKET_VERNOTSUPPORTED (integer)
SOCKET_NOTINITIALISED (integer)
SOCKET_HOST_NOT_FOUND (integer)
SOCKET_TRY_AGAIN (integer)
SOCKET_NO_RECOVERY (integer)
SOCKET_NO_DATA (integer)
SOCKET_NO_ADDRESS (integer)

The following constants are only available on UNIX-like platforms. Each constant is only defined if their equal is available on the platform.

SOCKET_EPERM (integer): Operation not permitted.
SOCKET_ENOENT (integer): No such file or directory.
SOCKET_EIO (integer): I/O error.
SOCKET_ENXIO (integer): No such device or address.
SOCKET_E2BIG (integer): Arg list too long.
SOCKET_EAGAIN (integer): Try again.
SOCKET_ENOMEM (integer): Out of memory.
SOCKET_ENOTBLK (integer): Block device required.
SOCKET_EBUSY (integer): Device or resource busy.
SOCKET_EEXIST (integer): File exists.
SOCKET_EXDEV (integer): Cross-device link.
SOCKET_ENODEV (integer): No such device.
SOCKET_ENOTDIR (integer): Not a directory.
SOCKET_EISDIR (integer): Is a directory.
SOCKET_ENFILE (integer): File table overflow.
SOCKET_ENOTTY (integer): Not a typewriter.
SOCKET_ENOSPC (integer): No space left on device.
SOCKET_ESPIPE (integer): Illegal seek.
SOCKET_EROFS (integer): Read-only file system.
SOCKET_EMLINK (integer): Too many links.
SOCKET_EPIPE (integer): Broken pipe.
SOCKET_ENOLCK (integer): No record locks available.
SOCKET_ENOSYS (integer): Function not implemented.
SOCKET_ENOMSG (integer): No message of desired type.
SOCKET_EIDRM (integer): Identifier removed.
SOCKET_ECHRNG (integer): Channel number out of range.
SOCKET_EL2NSYNC (integer): Level 2 not synchronized.
SOCKET_EL3HLT (integer): Level 3 halted.
SOCKET_EL3RST (integer): Level 3 reset.
SOCKET_ELNRNG (integer): Link number out of range.
SOCKET_EUNATCH (integer): Protocol driver not attached.
SOCKET_ENOCSI (integer): No CSI structure available.
SOCKET_EL2HLT (integer): Level 2 halted.
SOCKET_EBADE (integer): Invalid exchange.
SOCKET_EBADR (integer): Invalid request descriptor.
SOCKET_EXFULL (integer): Exchange full.
SOCKET_ENOANO (integer): No anode.
SOCKET_EBADRQC (integer): Invalid request code.
SOCKET_EBADSLT (integer): Invalid slot.
SOCKET_ENOSTR (integer): Device not a stream.
SOCKET_ENODATA (integer): No data available.
SOCKET_ETIME (integer): Timer expired.
SOCKET_ENOSR (integer): Out of streams resources.
SOCKET_ENONET (integer): Machine is not on the network.
SOCKET_ENOLINK (integer): Link has been severed.
SOCKET_EADV (integer): Advertise error.
SOCKET_ESRMNT (integer): Srmount error.
SOCKET_ECOMM (integer): Communication error on send.
SOCKET_EPROTO (integer): Protocol error.
SOCKET_EMULTIHOP (integer): Multihop attempted.
SOCKET_EBADMSG (integer): Not a data message.
SOCKET_ENOTUNIQ (integer): Name not unique on network.
SOCKET_EBADFD (integer): File descriptor in bad state.
SOCKET_EREMCHG (integer): Remote address changed.
SOCKET_ERESTART (integer): Interrupted system call should be restarted.
SOCKET_ESTRPIPE (integer): Streams pipe error.
SOCKET_EPROTOOPT (integer): Protocol not available.
SOCKET_ADDRINUSE (integer): Address already in use.
SOCKET_ETOOMANYREFS (integer): Too many references: cannot splice.
SOCKET_EISNAM (integer): Is a named type file.
SOCKET_EREMOTEIO (integer): Remote I/O error.
SOCKET_EDQUOT (integer): Quota exceeded.
SOCKET_ENOMEDIUM (integer): No medium found.
SOCKET_EMEDIUMTYPE (integer): Wrong medium type.