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Predefined Constants


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 only defined under Windows.

SOCKET_EINTR (integer)
SOCKET_EBADF (integer)
SOCKET_EACCES (integer)
SOCKET_EFAULT (integer)
SOCKET_EINVAL (integer)
SOCKET_EMFILE (integer)
SOCKET_EWOULDBLOCK (integer)
SOCKET_EINPROGRESS (integer)
SOCKET_EALREADY (integer)
SOCKET_ENOTSOCK (integer)
SOCKET_EDESTADDRREQ (integer)
SOCKET_EMSGSIZE (integer)
SOCKET_EPROTOTYPE (integer)
SOCKET_ENOPROTOOPT (integer)
SOCKET_EPROTONOSUPPORT (integer)
SOCKET_ESOCKTNOSUPPORT (integer)
SOCKET_EOPNOTSUPP (integer)
SOCKET_EPFNOSUPPORT (integer)
SOCKET_EAFNOSUPPORT (integer)
SOCKET_EADDRINUSE (integer)
SOCKET_EADDRNOTAVAIL (integer)
SOCKET_ENETDOWN (integer)
SOCKET_ENETUNREACH (integer)
SOCKET_ENETRESET (integer)
SOCKET_ECONNABORTED (integer)
SOCKET_ECONNRESET (integer)
SOCKET_ENOBUFS (integer)
SOCKET_EISCONN (integer)
SOCKET_ENOTCONN (integer)
SOCKET_ESHUTDOWN (integer)
SOCKET_ETOOMYREFS (integer)
SOCKET_ETIMEDOUT (integer)
SOCKET_ECONNREFUSED (integer)
SOCKET_ELOOP (integer)
SOCKET_ENAMETOOLONG (integer)
SOCKET_EHOSTDOWN (integer)
SOCKET_EHOSTUNREACH (integer)
SOCKET_ENOTEMPTY (integer)
SOCKET_EPROCLIM (integer)
SOCKET_EUSERS (integer)
SOCKET_EDUOT (integer)
SOCKET_ESTALE (integer)
SOCKET_EREMOTE (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_EINTR (integer)
Interrupted system call.
SOCKET_EIO (integer)
I/O error.
SOCKET_ENXIO (integer)
No such device or address.
SOCKET_E2BIG (integer)
Arg list too long.
SOCKET_EBADF (integer)
Bad file number.
SOCKET_EAGAIN (integer)
Try again.
SOCKET_ENOMEM (integer)
Out of memory.
SOCKET_EACCES (integer)
Permission denied.
SOCKET_EFAULT (integer)
Bad address.
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_EINVAL (integer)
Invalid argument.
SOCKET_ENFILE (integer)
File table overflow.
SOCKET_EMFILE (integer)
Too many open files.
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_ENAMETOOLONG (integer)
File name too long.
SOCKET_ENOLCK (integer)
No record locks available.
SOCKET_ENOSYS (integer)
Function not implemented.
SOCKET_ENOTEMPTY (integer)
Directory not empty.
SOCKET_ELOOP (integer)
Too many symbolic links encountered.
SOCKET_EWOULDBLOCK (integer)
Operation would block.
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_EREMOTE (integer)
Object is remote.
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_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_EPROTOOPT (integer)
Protocol not available.
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_ADDRINUSE (integer)
Address already in use.
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_ETOOMANYREFS (integer)
Too many references: cannot splice.
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.
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.

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