How PHP sends and sends data to the socket server

This article mainly introduces the methods for sending and receiving data from PHP to the socket server, analyzes the methods for sending and receiving data from the socket, and introduces common socket functions, for more information about how PHP sends and receives data from a socket server, see the following example. Share it with you for your reference. The details are as follows:

To send data to other programs in PHP, you need to use the socket function of php for an instance. let's look at an example with the code as follows:

The code is as follows:

/* Send and receive data through socket
@ Host (string) socket server IP address
@ Post (int) Port
@ Str (string) the data to be sent
@ Back 1 | 0 indicates whether data is returned from the socket.
Returns true | false | server data
*/
Function sendSocketMsg ($ host, $ port, $ str, $ back = 0 ){
$ Socket = socket_create (AF_INET, SOCK_STREAM, 0 );
If ($ socket <0) return false;
$ Result = @ socket_connect ($ socket, $ host, $ port );
If ($ result = false) return false;
Socket_write ($ socket, $ str, strlen ($ str ));

If ($ back! = 0 ){
$ Input = socket_read ($ socket, 1024 );
Socket_close ($ socket );
Return $ input;
} Else {
Socket_close ($ socket );
Return true;
}
}

The second parameter of socker_read is used to specify the number of bytes to read. you can use it to limit the size of data obtained from the client.

Sock function introduction

Function name	Description
Socket_accept ()	Accept a Socket connection
Socket_bind ()	Bind the socket to an IP address and port
Socket_clear_error ()	Clear socket errors or the final error code
Socket_close ()	Disables a socket resource.
Socket_connect ()	Start a socket connection
Socket_create_listen ()	Open a socket listener on the specified port
Socket_create_pair ()	Generate a pair of identical sockets into an array
Socket_create ()	Generate a socket, which is equivalent to the data structure of a socket.
Socket_get_option ()	Obtain socket options
Socket_getpeername ()	Obtain the IP address of a remote host.
Socket_getsockname ()	Obtain the IP address of the local socket
Socket_iovec_add ()	Add a new vector to a scattered/aggregated array
Socket_iovec_alloc ()	This function creates an iovec data structure that can send and receive read/write data.
Socket_iovec_delete ()	Delete an allocated iovec
Socket_iovec_fetch ()	Returns the data of the specified iovec resource.
Socket_iovec_free ()	Releases an iovec resource.
Socket_iovec_set ()	Set the new value of iovec data
Socket_last_error ()	Get the final error code of the current socket
Socket_listen ()	Listen to all connections from the specified socket
Socket_read ()	Read data of the specified length
Socket_readv ()	Read data from scattered/aggregated arrays
Socket_recv ()	End data from socket to cache
Socket_recvfrom ()	Accept data from the specified socket. if not specified, the current socket is used by default.
Socket_recvmsg ()	Receive messages from iovec
Socket_select ()	Multiple choice
Socket_send ()	This function sends data to the connected socket
Socket_sendmsg ()	Send messages to socket
Socket_sendto ()	Send a message to the socket of the specified address
Socket_set_block ()	Set block mode in socket
Socket_set_nonblock ()	Set to non-block mode in socket
Socket_set_option ()	Set socket options
Socket_shutdown ()	This function allows you to close the read, write, or specified socket
Socket_strerror ()	Returns a detailed error of the specified error number.
Socket_write ()	Write data to socket cache
Socket_writev ()	Write data to scattered/aggregated arrays

Note:The socket_read function reads the shell data until n, t, or character is met. the PHP script regards these characters as the input Terminator.

I hope this article will help you with php programming.