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socket_create
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_create — Create a socket (endpoint for communication)
Description
$domain
, int $type
, int $protocol
) : resourceCreates and returns a socket resource, also referred to as an endpoint of communication. A typical network connection is made up of 2 sockets, one performing the role of the client, and another performing the role of the server.
Parameters
-
domain -
The
domainparameter specifies the protocol family to be used by the socket.Available address/protocol families Domain Description AF_INETIPv4 Internet based protocols. TCP and UDP are common protocols of this protocol family. AF_INET6IPv6 Internet based protocols. TCP and UDP are common protocols of this protocol family. AF_UNIXLocal communication protocol family. High efficiency and low overhead make it a great form of IPC (Interprocess Communication). -
type -
The
typeparameter selects the type of communication to be used by the socket.Available socket types Type Description SOCK_STREAMProvides sequenced, reliable, full-duplex, connection-based byte streams. An out-of-band data transmission mechanism may be supported. The TCP protocol is based on this socket type. SOCK_DGRAMSupports datagrams (connectionless, unreliable messages of a fixed maximum length). The UDP protocol is based on this socket type. SOCK_SEQPACKETProvides a sequenced, reliable, two-way connection-based data transmission path for datagrams of fixed maximum length; a consumer is required to read an entire packet with each read call. SOCK_RAWProvides raw network protocol access. This special type of socket can be used to manually construct any type of protocol. A common use for this socket type is to perform ICMP requests (like ping). SOCK_RDMProvides a reliable datagram layer that does not guarantee ordering. This is most likely not implemented on your operating system. -
protocol -
The
protocolparameter sets the specific protocol within the specifieddomainto be used when communicating on the returned socket. The proper value can be retrieved by name by using getprotobyname(). If the desired protocol is TCP, or UDP the corresponding constantsSOL_TCP, andSOL_UDPcan also be used.Common protocols Name Description icmp The Internet Control Message Protocol is used primarily by gateways and hosts to report errors in datagram communication. The "ping" command (present in most modern operating systems) is an example application of ICMP. udp The User Datagram Protocol is a connectionless, unreliable, protocol with fixed record lengths. Due to these aspects, UDP requires a minimum amount of protocol overhead. tcp The Transmission Control Protocol is a reliable, connection based, stream oriented, full duplex protocol. TCP guarantees that all data packets will be received in the order in which they were sent. If any packet is somehow lost during communication, TCP will automatically retransmit the packet until the destination host acknowledges that packet. For reliability and performance reasons, the TCP implementation itself decides the appropriate octet boundaries of the underlying datagram communication layer. Therefore, TCP applications must allow for the possibility of partial record transmission.
Return Values
socket_create() returns a socket resource on success,
or FALSE on error. The actual error code can be retrieved by calling
socket_last_error(). This error code may be passed to
socket_strerror() to get a textual explanation of the
error.
Errors/Exceptions
If an invalid domain or
type is given, socket_create()
defaults to AF_INET and
SOCK_STREAM respectively and additionally emits an
E_WARNING message.
See Also
- socket_accept() - Accepts a connection on a socket
- socket_bind() - Binds a name to a socket
- socket_connect() - Initiates a connection on a socket
- socket_listen() - Listens for a connection on a socket
- socket_last_error() - Returns the last error on the socket
- socket_strerror() - Return a string describing a socket error
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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