How can I program socket in unix?

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LEARN ABOUT PHP

socket_last_error

SOCKET_LAST_ERROR(3)							 1						      SOCKET_LAST_ERROR(3)

socket_last_error - Returns the last error on the socket

SYNOPSIS

       int socket_last_error ([resource  $socket])

DESCRIPTION

	If  a  socket  resource  is  passed  to  this function, the last error which occurred on this particular socket is returned. If the socket
       resource is omitted, the error code of the last failed socket function is returned. The latter is particularly helpful for  functions  like
       socket_create(3)  which	don't return a socket on failure and socket_select(3) which can fail for reasons not directly tied to a particular
       socket. The error code is suitable to be fed to socket_strerror(3) which returns a string describing the given error code.

PARAMETERS

	      o $socket
		- A valid socket resource created with socket_create(3).

RETURN VALUES

	This function returns a socket error code.

EXAMPLES

       Example #1

	      socket_last_error(3) example

	      <?php
	      $socket = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

	      if ($socket === false) {
		  $errorcode = socket_last_error();
		  $errormsg = socket_strerror($errorcode);

		  die("Couldn't create socket: [$errorcode] $errormsg");
	      }
	      ?>

NOTES

       Note

	      socket_last_error(3) does not clear the error code, use socket_clear_error(3) for this purpose.

PHP Documentation Group 												      SOCKET_LAST_ERROR(3)

Programming