(PHP 4 >= 4.1.0, PHP 5)socket_create_pair -- Creates a pair of indistinguishable sockets and stores them in an array.
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
socket_create_pair() creates two connected and indistinguishable sockets, and stores them in &fd. This function is commonly used in IPC (InterProcess Communication).
The domain parameter specifies the protocol family to be used by the socket.
Table 1. Available address/protocol families
|AF_INET||IPv4 Internet based protocols. TCP and UDP are common protocols of this protocol family. Supported only in windows.|
|AF_INET6||IPv6 Internet based protocols. TCP and UDP are common protocols of this protocol family. Support added in PHP 5.0.0. Supported only in windows.|
|AF_UNIX||Local communication protocol family. High efficiency and low overhead make it a great form of IPC (Interprocess Communication).|
The type parameter selects the type of communication to be used by the socket.
Table 2. Available socket types
|SOCK_STREAM||Provides 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_DGRAM||Supports datagrams (connectionless, unreliable messages of a fixed maximum length). The UDP protocol is based on this socket type.|
|SOCK_SEQPACKET||Provides 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_RAW||Provides 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, traceroute, etc).|
|SOCK_RDM||Provides a reliable datagram layer that does not guarantee ordering. This is most likely not implemented on your operating system.|
The protocol parameter sets the specific protocol within the specified domain to 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 constants SOL_TCP, and SOL_UDP can also be used.
Table 3. Common protocols
|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.|
Example 1. socket_create_pair() example
Example 2. socket_create_pair() IPC example
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