PHP implements the method of connecting devices, communicating and sending commands, PHP command _php tutorial

PHP implements methods for connecting devices, communicating, and sending commands, and PHP commands

This article describes how PHP implements connection devices, communication, and sending commands. Share to everyone for your reference. Specific as follows:

The development of the BS architecture of the Software (PHP), need to communicate with the device, in this record, welcome you to correct:

1. Using the TCP/IP connection device with PHP socket technology

Parameter $service_port connection port
Parameter $address send IP address
Parameter $in Send command

function Send_socket_connect ($service _port, $address, $in) {//Create TCP/IP Socket$socket = socket_create (Af_inet, Sock_ STREAM, sol_tcp) or die ("could not create socket!");  Set time-out  $timeout = 2;  $time = time ();  Set the non-blocking mode  @socket_set_nonblock ($socket);  Time-out judgment while  (! @socket_connect ($socket, $address, $service _port)) {    $err = Socket_last_error ($socket);    The connection succeeds, jumping out of the loop    if ($err = = = 10056) {break      ;    }    Connection failed, determine timeout, stop    if (time ()-$time) >= $timeout) {      socket_close ($socket);      Print (' Network exception ', please check the network connection!! ');      Exit ();    }    Refresh rate (250 ms)    Usleep (250000);  }  Set the blocking mode  @socket_set_block ($socket);  Send command to Device  Socket_write ($socket, $in, strlen ($in));  Close connection  socket_close ($socket);}

Send_socker_xdcoder $buffer as the return value

function Send_socket_xdcoder ($service _port, $address, $in) {  //create TCP/IP socket  $socket = socket_create (af_ INET, Sock_stream, sol_tcp) or die ("could not create socket!");  Set time-out  $timeout = 2;  $time = time ();  Set the non-blocking mode  @socket_set_nonblock ($socket);  Time-out judgment while  (! @socket_connect ($socket, $address, $service _port)) {    $err = Socket_last_error ($socket);    Successful connection    if ($err = = = 10056) {break      ;    }    Connection failed, determine timeout, stop    if (time ()-$time) >= $timeout) {      socket_close ($socket);      echo "";      Exit ();    }    Refresh rate (250 ms)    Usleep (250000);  }  Set the blocking mode  @socket_set_block ($socket);  Send command to Device  Socket_write ($socket, $in, strlen ($in));  The receive device command returns data  $buffer = Socket_read ($socket, 1024x768, php_normal_read);  Close connection  socket_close ($socket);  Output return value returns  $buffer;}

2. Using the PHP socket technology to connect the device with the UDP protocol for communication and sending commands

Parameter $service_port connection port
Parameter $address send IP address
Parameter $in Send command

function send_socket_connect_udp ($service _port, $address, $in) {  //Use the UDP protocol with the PHP socket technology to connect the device  $socket = socket _create (Af_inet, Sock_dgram, sol_udp);  @socket_set_option ($socket, Sol_socket, So_rcvtimeo, Array ("SEC" = 2, "usec" and "= 0)");  Send command  @socket_sendto ($socket, $in, strlen ($in), 0, $address, $service _port);  @socket_recvfrom ($socket, $buffer, 1024x768, Msg_waitall, $address, $service _port);  Close connection  if (empty ($buffer)) {    echo "";  }}

SEND_SOCKET_XDCODER_UDP $buffer as the return value

function send_socket_xdcoder_udp ($service _port, $address, $in) {  //Use the UDP protocol with the PHP socket technology to connect the device  $socket = socket _create (Af_inet, Sock_dgram, sol_udp);  @socket_set_option ($socket, Sol_socket, So_rcvtimeo, Array ("SEC" = 2, "usec" and "= 0)");  Send command  @socket_sendto ($socket, $in, strlen ($in), 0, $address, $service _port);  @socket_recvfrom ($socket, $buffer, 1024x768, Msg_waitall, $address, $service _port);  Close connection  socket_close ($socket);  if (!empty ($buffer)) {    return $buffer;  } else {    echo "";  }}

3. Use RS232 serial port technology to connect the device, realize communication and send command

Parameter $com string number
Parameter $baudratr baud rate
Parameter $in Send command

function Rs232_connect ($com, $baudrate, $in) {  @set_time_limit;  Use ' windows to set channeling parameters ';  EXEC ("mode"). $com. "Baud=". $baudrate. "Parity=n data=8 stop=1 Odsr=off");  "Open port serial $com";  $f = @fopen ($com, ' w+ ');  Determine if the serial port is open correctly if  (! $f) {    //echo "";    Die ("Error when Open $com");  }  Send data to the serial port;  Fwrite ($f, $in);  Close Port      fclose ($f);  End of serial port operation}

There is also a command 16 binary conversion:

function Hextostr ($hex) {  $string = "";  for ($i = 0; $i < strlen ($hex) 1; $i +=3) {    $string. =CHR (Hexdec ($hex [$i]. $hex [$i + 1]);  }  return $string;}

I hope this article is helpful to everyone's PHP programming.

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