socket_write

Description

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

The function socket_write() writes to the socket socket from buffer.

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

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

注: socket_write() 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 unintentionally forget to transmit the rest of your data.

注: It is perfectly valid for socket_write() 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.

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webmaster at you-are-infected dot com
24-Aug-2006 01:27


If you connect to a Server in a way like you do with telnet or some similar protokoll you may have problems with sending data to the server. I found out that at some servers there is a different between:



<?php

    

    socket_write ($my_socket, $line, strlen ($line));

    socket_write ($my_socket, "\r\n", strlen ("\r\n"));

    

?>

witch worked at least, and 

<?php

    socket_write ($my_socket, $line."\r\n", strlen ($line."\r\n"));

?>

wich made the server stop sending any data.



I hope this helps to save a lot of time. I needed about two days to find out, that this was the problem ;)

gtk at linux dot online dot no
20-Aug-2002 07:43


from http://www.manualy.sk/sock-faq/unix-socket-faq-2.html

read() is equivalent to recv() with a flags parameter of 0. Other values for the flags parameter change the behaviour of recv(). Similarly, write() is equivalent to send() with flags == 0.

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