php man page for socket_write

SOCKET_WRITE(3) 							 1							   SOCKET_WRITE(3)

socket_write - Write to a socket

SYNOPSIS
       int socket_write (resource  $socket, string  $buffer, [int  $length])

DESCRIPTION
	The function socket_write(3) writes to the $socket from the given $buffer.

PARAMETERS
	      o $socket
		-

	      o $buffer
		- The buffer to be written.

	      o $length
		-  The	optional  parameter $length can specify an alternate length of bytes written to the socket. If this length is greater than
		the buffer length, it is silently truncated to the length of the buffer.

RETURN VALUES
	Returns the number  of	bytes  successfully  written  to  the  socket  or  FALSE  on  failure.	The  error  code  can  be  retrieved  with
       socket_last_error(3). This code may be passed to socket_strerror(3) to get a textual explanation of the error.

       Note

	       It is perfectly valid for socket_write(3) to return zero which means no bytes have been written. Be sure to use the === operator to
	      check for FALSE in case of an error.

NOTES
       Note

	      socket_write(3) does not necessarily write all bytes from the given buffer. It's valid that, depending on the network buffers  etc.,
	      only  a certain amount of data, even one byte, is written though your buffer is greater. You have to watch out so you don't uninten-
	      tionally forget to transmit the rest of your data.

SEE ALSO
       socket_accept(3), socket_bind(3), socket_connect(3), socket_listen(3), socket_read(3), socket_strerror(3).

PHP Documentation Group 													   SOCKET_WRITE(3)