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.