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
(int )
Socket address family of filesystem pathnames in the Unix Domain.
AF_INET
(int )
Socket address family of IPv4 in the Internet Domain.
AF_INET6
(int )
Socket address family of IPv6 in the Internet Domain. Only available if compiled with IPv6 support.
AF_DIVERT
(int )
Socket address family for the FreeBSD divert(4)
interface, used to receive packets diverted by the firewall.
Available as of PHP 8.3.0 (FreeBSD only).
AF_PACKET
(int )
Socket address family for low-level packet sockets, used to send and receive raw packets at the device-driver (OSI layer 2) level. Available as of PHP 8.5.0 (Linux only).
SOCK_STREAM
(int )
SOCK_DGRAM
(int )
SOCK_RAW
(int )
SOCK_SEQPACKET
(int )
SOCK_RDM
(int )
SOCK_CONN_DGRAM
(int )
Set the socket to a connection-oriented datagram. Available as of PHP 8.4.0. (NetBSD only)
SOCK_DCCP
(int )
Set the socket to a datagram congestion control protocol. Available as of PHP 8.4.0. (NetBSD only)
SOCK_NONBLOCK
(int )
Set the non-blocking socket status flag. Available as of PHP 8.4.0.
SOCK_CLOEXEC
(int )
Set the close-on-exec socket status flag. Available as of PHP 8.4.0.
MSG_OOB
(int )
MSG_WAITALL
(int )
MSG_PEEK
(int )
MSG_DONTROUTE
(int )
MSG_EOR
(int )
Not available on Windows platforms.
MSG_EOF
(int )
Not available on Windows platforms.
MSG_ZEROCOPY
(int )
Available as of PHP 8.2.0
SO_DEBUG
(int )
SO_REUSEADDR
(int )
SO_REUSEPORT
(int )
This constant is only available on platforms that
support the SO_REUSEPORT socket option: this
includes Linux, macOS and *BSD, but does not include Windows.
SO_KEEPALIVE
(int )
SO_DONTROUTE
(int )
SO_LINGER
(int )
SO_BROADCAST
(int )
SO_OOBINLINE
(int )
SO_SNDBUF
(int )
SO_RCVBUF
(int )
SO_SNDLOWAT
(int )
SO_RCVLOWAT
(int )
SO_SNDTIMEO
(int )
SO_RCVTIMEO
(int )
SO_TYPE
(int )
SO_ERROR
(int )
SO_ZEROCOPY
(int )
Available as of PHP 8.2.0
TCP_NODELAY
(int )
Used to disable Nagle TCP algorithm.
TCP_KEEPCNT
(int )
Available as of PHP 8.2.0
TCP_KEEPIDLE
(int )
Available as of PHP 8.2.0
TCP_KEEPINTVL
(int )
Available as of PHP 8.2.0
TCP_KEEPALIVE
(int )
Available as of PHP 8.2.0
TCP_NOTSENT_LOWAT
(int )
Available as of PHP 8.2.0
SO_MARK
(int )
Available as of PHP 8.1.0
Available as of PHP 8.1.0
SO_RTABLE
(int )
Available as of PHP 8.2.0
SO_ACCEPTFILTER
(int )
Available as of PHP 8.1.0
SO_DONTTRUNC
(int )
Available as of PHP 8.1.0
SO_WANTMORE
(int )
Available as of PHP 8.1.0
SO_INCOMING_CPU
(int )
Available as of PHP 8.2.0
SO_MEMINFO
(int )
Available as of PHP 8.2.0
SO_BPF_EXTENSIONS
(int )
Available as of PHP 8.2.0
SO_SETFIB
(int )
Available as of PHP 8.2.0
SO_ATTACH_REUSEPORT_CBPF
(int )
Available as of PHP 8.3.0 (Linux only)
SO_DETACH_BPF
(int )
Available as of PHP 8.3.0 (Linux only)
SO_DETACH_FILTER
(int )
Available as of PHP 8.3.0 (Linux only)
SO_RERROR
(int )
Available as of PHP 8.3.0 (NetBSD only)
SO_ZEROIZE
(int )
Available as of PHP 8.3.0 (OpenBSD only)
SO_SPLICE
(int )
Available as of PHP 8.3.0 (OpenBSD only)
SO_REUSEPORT_LB
(int )
Available as of PHP 8.3.0 (FreeBSD only)
SOL_FILTER
(int )
Available as of PHP 8.2.0
SOL_UDPLITE
(int )
Available as of PHP 8.3.0
UDPLITE_RECV_CSCOV
(int )
Available as of PHP 8.3.0
UDPLITE_SEND_CSCOV
(int )
Available as of PHP 8.3.0
TCP_DEFER_ACCEPT
(int )
Available as of PHP 8.1.0
TCP_CONGESTION
(int )
Available as of PHP 8.2.0
TCP_QUICKACK
(int )
Available as of PHP 8.3.0 (Linux only)
TCP_REPAIR
(int )
Available as of PHP 8.3.0 (Linux only)
TCP_SYNCNT
(int )
Set the number of SYN retransmits that TCP should send before aborting the attempt to connect. Available as of PHP 8.4.0 (Linux only)
IP_DONTFRAG
(int )
Available as of PHP 8.3.0 (FreeBSD only)
IP_MTU_DISCOVER
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_DO
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_DONT
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_WANT
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_PROBE
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_INTERFACE
(int )
Available as of PHP 8.3.0 (Linux only)
IP_PMTUDISC_OMIT
(int )
Available as of PHP 8.3.0 (Linux only)
IP_BIND_ADDRESS_NO_PORT
(int )
Available as of PHP 8.3.0 (Linux only)
SOL_SOCKET
(int )
PHP_NORMAL_READ
(int )
PHP_BINARY_READ
(int )
SOL_TCP
(int )
SOL_UDP
(int )
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
(int )
Interrupted system call.
SOCKET_EBADF
(int )
Bad file descriptor number.
SOCKET_EACCES
(int )
Permission denied.
SOCKET_EFAULT
(int )
Bad address.
SOCKET_EINVAL
(int )
Invalid argument.
SOCKET_EMFILE
(int )
Too many open files.
SOCKET_ENAMETOOLONG
(int )
File name too long.
SOCKET_ENOTEMPTY
(int )
Directory not empty.
SOCKET_ELOOP
(int )
Too many symbolic links encountered.
SOCKET_EWOULDBLOCK
(int )
Operation would block.
SOCKET_EREMOTE
(int )
Object is remote.
SOCKET_EUSERS
(int )
Too many users.
SOCKET_ENOTSOCK
(int )
Socket operation on non-socket.
SOCKET_EDESTADDRREQ
(int )
Destination address required.
SOCKET_EMSGSIZE
(int )
Message too long.
SOCKET_EPROTOTYPE
(int )
Protocol wrong type for socket.
SOCKET_EPROTONOSUPPORT
(int )
Protocol not supported.
SOCKET_ESOCKTNOSUPPORT
(int )
Socket type not supported.
SOCKET_EOPNOTSUPP
(int )
Operation not supported on transport endpoint.
SOCKET_EPFNOSUPPORT
(int )
Protocol family not supported.
SOCKET_EAFNOSUPPORT
(int )
Address family not supported by protocol.
SOCKET_EADDRNOTAVAIL
(int )
Cannot assign requested address.
SOCKET_ENETDOWN
(int )
Network is down.
SOCKET_ENETUNREACH
(int )
Network is unreachable.
SOCKET_ENETRESET
(int )
Network dropped connection because of reset.
SOCKET_ECONNABORTED
(int )
Software caused connection abort.
SOCKET_ECONNRESET
(int )
Connection reset by peer.
SOCKET_ENOBUFS
(int )
No buffer space available.
SOCKET_EISCONN
(int )
Transport endpoint is already connected.
SOCKET_ENOTCONN
(int )
Transport endpoint is not connected.
SOCKET_ESHUTDOWN
(int )
Cannot send after transport endpoint shutdown.
SOCKET_ETIMEDOUT
(int )
Connection timed out.
SOCKET_ECONNREFUSED
(int )
Connection refused.
SOCKET_EHOSTDOWN
(int )
Host is down.
SOCKET_EHOSTUNREACH
(int )
No route to host.
SOCKET_EALREADY
(int )
Operation already in progress.
SOCKET_EINPROGRESS
(int )
Operation now in progress.
The following constants are only defined under Windows.
SOCKET_ENOPROTOOPT
(int )
SOCKET_EADDRINUSE
(int )
SOCKET_ETOOMYREFS
(int )
SOCKET_EPROCLIM
(int )
SOCKET_EDUOT
(int )
SOCKET_ESTALE
(int )
SOCKET_EDISCON
(int )
SOCKET_SYSNOTREADY
(int )
SOCKET_VERNOTSUPPORTED
(int )
SOCKET_NOTINITIALISED
(int )
SOCKET_HOST_NOT_FOUND
(int )
SOCKET_TRY_AGAIN
(int )
SOCKET_NO_RECOVERY
(int )
SOCKET_NO_DATA
(int )
SOCKET_NO_ADDRESS
(int )
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
(int )
Operation not permitted.
SOCKET_ENOENT
(int )
No such file or directory.
SOCKET_EIO
(int )
I/O error.
SOCKET_ENXIO
(int )
No such device or address.
SOCKET_E2BIG
(int )
Arg list too long.
SOCKET_EAGAIN
(int )
Try again.
SOCKET_ENOMEM
(int )
Out of memory.
SOCKET_ENOTBLK
(int )
Block device required.
SOCKET_EBUSY
(int )
Device or resource busy.
SOCKET_EEXIST
(int )
File exists.
SOCKET_EXDEV
(int )
Cross-device link.
SOCKET_ENODEV
(int )
No such device.
SOCKET_ENOTDIR
(int )
Not a directory.
SOCKET_EISDIR
(int )
Is a directory.
SOCKET_ENFILE
(int )
File table overflow.
SOCKET_ENOTTY
(int )
Not a typewriter.
SOCKET_ENOSPC
(int )
No space left on device.
SOCKET_ESPIPE
(int )
Illegal seek.
SOCKET_EROFS
(int )
Read-only file system.
SOCKET_EMLINK
(int )
Too many links.
SOCKET_EPIPE
(int )
Broken pipe.
SOCKET_ENOLCK
(int )
No record locks available.
SOCKET_ENOSYS
(int )
Function not implemented.
SOCKET_ENOMSG
(int )
No message of desired type.
SOCKET_EIDRM
(int )
Identifier removed.
SOCKET_ECHRNG
(int )
Channel number out of range.
SOCKET_EL2NSYNC
(int )
Level 2 not synchronized.
SOCKET_EL3HLT
(int )
Level 3 halted.
SOCKET_EL3RST
(int )
Level 3 reset.
SOCKET_ELNRNG
(int )
Link number out of range.
SOCKET_EUNATCH
(int )
Protocol driver not attached.
SOCKET_ENOCSI
(int )
No CSI structure available.
SOCKET_EL2HLT
(int )
Level 2 halted.
SOCKET_EBADE
(int )
Invalid exchange.
SOCKET_EBADR
(int )
Invalid request descriptor.
SOCKET_EXFULL
(int )
Exchange full.
SOCKET_ENOANO
(int )
No anode.
SOCKET_EBADRQC
(int )
Invalid request code.
SOCKET_EBADSLT
(int )
Invalid slot.
SOCKET_ENOSTR
(int )
Device not a stream.
SOCKET_ENODATA
(int )
No data available.
SOCKET_ETIME
(int )
Timer expired.
SOCKET_ENOSR
(int )
Out of streams resources.
SOCKET_ENONET
(int )
Machine is not on the network.
SOCKET_ENOLINK
(int )
Link has been severed.
SOCKET_EADV
(int )
Advertise error.
SOCKET_ESRMNT
(int )
Srmount error.
SOCKET_ECOMM
(int )
Communication error on send.
SOCKET_EPROTO
(int )
Protocol error.
SOCKET_EMULTIHOP
(int )
Multihop attempted.
SOCKET_EBADMSG
(int )
Not a data message.
SOCKET_ENOTUNIQ
(int )
Name not unique on network.
SOCKET_EBADFD
(int )
File descriptor in bad state.
SOCKET_EREMCHG
(int )
Remote address changed.
SOCKET_ERESTART
(int )
Interrupted system call should be restarted.
SOCKET_ESTRPIPE
(int )
Streams pipe error.
SOCKET_EPROTOOPT
(int )
Protocol not available.
SOCKET_ADDRINUSE
(int )
Address already in use.
SOCKET_ETOOMANYREFS
(int )
Too many references: cannot splice.
SOCKET_EISNAM
(int )
Is a named type file.
SOCKET_EREMOTEIO
(int )
Remote I/O error.
SOCKET_EDQUOT
(int )
Quota exceeded.
SOCKET_ENOMEDIUM
(int )
No medium found.
SOCKET_EMEDIUMTYPE
(int )
Wrong medium type.
SCM_RIGHTS
(int )
Send or receive a set of open file descriptors from another process.
SCM_CREDENTIALS
(int )
SCM_CREDS
(int )
Available as of PHP 8.2.0
SCM_CREDS2
(int )
Available as of PHP 8.2.0
LOCAL_CREDS
(int )
Available as of PHP 8.2.0
LOCAL_CREDS_PERSISTENT
(int )
Available as of PHP 8.2.0
SKF_AD_OFF
(int )
Available as of PHP 8.2.0
SKF_AD_PROTOCOL
(int )
Available as of PHP 8.2.0
SKF_AD_PKTTYPE
(int )
Available as of PHP 8.2.0
SKF_AD_IFINDEX
(int )
Available as of PHP 8.2.0
SKF_AD_NLATTR
(int )
Available as of PHP 8.2.0
SKF_AD_NLATTR_NEST
(int )
Available as of PHP 8.2.0
SKF_AD_MARK
(int )
Available as of PHP 8.2.0
SKF_AD_QUEUE
(int )
Available as of PHP 8.2.0
SKF_AD_HATYPE
(int )
Available as of PHP 8.2.0
SKF_AD_RXHASH
(int )
Available as of PHP 8.2.0
SKF_AD_CPU
(int )
Available as of PHP 8.2.0
SKF_AD_ALU_XOR_X
(int )
Available as of PHP 8.2.0
SKF_AD_VLAN_TAG
(int )
Available as of PHP 8.2.0
SKF_AD_VLAN_TAG_PRESENT
(int )
Available as of PHP 8.2.0
SKF_AD_PAY_OFFSET
(int )
Available as of PHP 8.2.0
SKF_AD_RANDOM
(int )
Available as of PHP 8.2.0
SKF_AD_VLAN_TPID
(int )
Available as of PHP 8.2.0
SKF_AD_MAX
(int )
Available as of PHP 8.2.0
AI_ADDRCONFIG
(int )
AI_ALL
(int )
AI_CANONIDN
(int )
AI_CANONNAME
(int )
AI_IDN
(int )
AI_NUMERICHOST
(int )
AI_NUMERICSERV
(int )
AI_PASSIVE
(int )
AI_V4MAPPED
(int )
FIL_ATTACH
(int )
FIL_DETACH
(int )
IPPROTO_IP
(int )
IPPROTO_IPV6
(int )
IPV6_HOPLIMIT
(int )
IPV6_MULTICAST_HOPS
(int )
IPV6_MULTICAST_IF
(int )
IPV6_MULTICAST_LOOP
(int )
IPV6_PKTINFO
(int )
IPV6_RECVHOPLIMIT
(int )
IPV6_RECVPKTINFO
(int )
IPV6_RECVTCLASS
(int )
IPV6_TCLASS
(int )
IPV6_UNICAST_HOPS
(int )
IPV6_V6ONLY
(int )
IP_MULTICAST_IF
(int )
IP_MULTICAST_LOOP
(int )
IP_MULTICAST_TTL
(int )
IP_PORTRANGE
(int )
Set the port range used for selecting a local port number. Available as of PHP 8.4.0. (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_DEFAULT
(int )
Use the default range of port values. Available as of PHP 8.4.0. (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_HIGH
(int )
Use a high range of port values. Available as of PHP 8.4.0. (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_LOW
(int )
Use a low range of port values. Available as of PHP 8.4.0. (FreeBSD/NetBSD/OpenBSD only)
MCAST_BLOCK_SOURCE
(int )
MCAST_JOIN_GROUP
(int )
MCAST_JOIN_SOURCE_GROUP
(int )
MCAST_LEAVE_GROUP
(int )
MCAST_LEAVE_SOURCE_GROUP
(int )
MCAST_UNBLOCK_SOURCE
(int )
MSG_CMSG_CLOEXEC
(int )
MSG_CONFIRM
(int )
MSG_CTRUNC
(int )
MSG_DONTWAIT
(int )
MSG_ERRQUEUE
(int )
MSG_MORE
(int )
MSG_NOSIGNAL
(int )
MSG_TRUNC
(int )
MSG_WAITFORONE
(int )
SOL_LOCAL
(int )
SOMAXCONN
(int )
SO_BINDTODEVICE
(int )
SO_FAMILY
(int )
SO_LABEL
(int )
SO_LISTENQLEN
(int )
SO_LISTENQLIMIT
(int )
SO_PASSCRED
(int )
SO_PEERLABEL
(int )
SO_EXCLUSIVEADDRUSE
(int )
Prevents other sockets from being forcibly bound to the same address and port. Available as of PHP 8.4.0. (Windows only)
SO_EXCLBIND
(int )
Enable/disable exclusive binding of the socket. Available as of PHP 8.4.0. (Solaris only)
SO_NOSIGPIPE
(int )
Controls generation of SIGPIPE for the socket. Available as of PHP 8.4.0. (macOs and FreeBSD only)
SO_LINGER_SEC
(int )
Similar to SO_LINGER but lingering is in seconds
as opposed to time clicks on macOs.
Available as of PHP 8.4.0. (macOs only)
SO_BINDTOIFINDEX
(int )
Bind a socket to a specific network interface by its index. Available as of PHP 8.4.0.
SHUT_RD
(int )
Disables further receive operations on the socket. Used with socket_shutdown() . Available as of PHP 8.5.0.
SHUT_WR
(int )
Disables further send operations on the socket. Used with socket_shutdown() . Available as of PHP 8.5.0.
SHUT_RDWR
(int )
Disables further send and receive operations on the socket. Used with socket_shutdown() . Available as of PHP 8.5.0.
UDP_SEGMENT
(int )
Sets the maximum size of UDP Generic Segmentation Offload (GSO) segments, allowing multiple datagrams to be sent in a single system call. Available on Linux only. Available as of PHP 8.5.0.
SO_BUSY_POLL
(int )
Sets the approximate time in microseconds to busy poll on a blocking receive when there is no data. This reduces latency at the cost of CPU. Available on Linux only. Available as of PHP 8.5.0.
IP_BINDANY
(int )
Allows binding a socket to any address, even if it is not local. Available on FreeBSD, NetBSD, and OpenBSD only. Available as of PHP 8.5.0.
TCP_FUNCTION_BLK
(int )
Selects the TCP stack (function block) used by the socket. With
socket_set_option() the value is the name of the stack
as a string ; socket_get_option() returns an
array with the function_set_name and
pcbcnt keys.
Available on FreeBSD only.
Available as of PHP 8.5.0.
TCP_FUNCTION_ALIAS
(int )
Retrieves the alias of the TCP stack used by the socket, as an array with
the function_set_name and pcbcnt keys.
Available on FreeBSD only.
Available as of PHP 8.5.0.
TCP_REUSPORT_LB_NUMA
(int )
Controls NUMA domain affinity for load-balanced port reuse. Available on FreeBSD only. Available as of PHP 8.5.0.
TCP_REUSPORT_LB_NUMA_NODOM
(int )
Constant value for TCP_REUSPORT_LB_NUMA indicating
no NUMA domain affinity.
Available on FreeBSD only.
Available as of PHP 8.5.0.
TCP_REUSPORT_LB_NUMA_CURDOM
(int )
Constant value for TCP_REUSPORT_LB_NUMA indicating
affinity for the current NUMA domain.
Available on FreeBSD only.
Available as of PHP 8.5.0.
TCP_BBR_ALGORITHM
(int )
Socket option related to the BBR (Bottleneck Bandwidth and Round-trip propagation time) congestion control algorithm. Available on FreeBSD only. Available as of PHP 8.5.0.
IPPROTO_ICMP
(int )
Internet Control Message Protocol (ICMP) protocol number, used when creating raw sockets. Available as of PHP 8.5.0.
IPPROTO_ICMPV6
(int )
Internet Control Message Protocol version 6 (ICMPv6) protocol number, used when creating raw IPv6 sockets. Available as of PHP 8.5.0.
$a = get_defined_constants(TRUE);
foreach ($a as $k => $v) {
printf('%-25s <br/>', $k);
foreach ($v as $k => $v) {
printf('  --->%-25s %d<br/>', $k, $v);
}
}
this may look duplicate for previous anonymous post but that code snippet only return 1 for constants value
1-->first called the get_defined_constants by passing argument true to categorize the data
2-->then using foreach iterate over index of the array
3-->here printf is used to print title of the category
4-->then it move on to interrior array and display the list of contants available in each category along with its valueSeems like SOCKET_EAGAIN is an alias of SOCKET_EWOULDBLOCK (int 11)