Socket 函数
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socket_write

(PHP 4 >= 4.1.0, PHP 5)

socket_write — Write to a socket

说明

int socket_write ( resource $socket , string $buffer [, int $length = 0 ] )

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

参数

socket

buffer

The buffer to be written.

length

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.

返回值

Returns the number of bytes successfully written to the socket 或者在失败时返回 FALSE. 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.

Note:

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.

注释

Note:

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.

参见

Socket 函数
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PHP手册
PHP手册 - N: Write to a socket

用户评论:

jean at briskula dot si (03-Feb-2011 11:00)

Some clients (Flash's XMLSocket for example) won't fire a read event until a new line is recieved.

<?php
    /*
     * Write to a socket
     * add a newline and null character at the end
     * some clients don't read until new line is recieved
     *
     * try to send the rest of the data if it gets truncated
     */
    function write(&$sock,$msg) {
        $msg = "$msg\n\0";
        $length = strlen($msg);
        while(true) {
            $sent = socket_write($sock,$msg,$length);
            if($sent === false) {
                return false;
            }
            if($sent < $length) {
                $msg = substr($msg, $sent);
                $length -= $sent;
                print("Message truncated: Resending: $msg");
            } else {
                return true;
            }
        }
        return false;
    }
?>

revelable at hotmail dot com (21-Dec-2010 01:08)

Here we have the same function to write a socket but with improved performance.

If the messager are not larger, they will be written entirely with a single socket_write() call. And is not needed to call the substr() function for the first bucle.

<?php
$st="Message to sent";
$length = strlen($st);
       
    while (true) {
       
        $sent = socket_write($socket, $st, $length);
           
        if ($sent === false) {
       
            break;
        }
           
        // Check if the entire message has been sented
        if ($sent < $length) {
               
            // If not sent the entire message.
            // Get the part of the message that has not yet been sented as message
            $st = substr($st, $sent);
               
            // Get the length of the not sented part
            $length -= $sent;

        } else {
           
            break;
        }
           
    }
?>

slyv at poczta dot onet dot pl (13-Feb-2009 10:16)

"socket_write() does not necessarily write all bytes from the given buffer."
So I wrote the following code to correctly write message to the socket

<?php
$message="Message to sent";
$len = strlen($message);
$offset = 0;
while ($offset < $len) {
    $sent = socket_write($socket, substr($message, $offset), $len-$offset);
    if ($sent === false) {
        // Error occurred, break the while loop
        break;
    }
    $offset += $sent;
}
if ($offset < $len) {
    $errorcode = socket_last_error();
    $errormsg = socket_strerror($errorcode);
    echo "SENDING ERROR: $errormsg";
} else {
        // Data sent ok
}
?>

masterwaster at gmail dot com (26-Aug-2008 07:42)

Hi,
if you got same problems like i have

<?php
@socket_write($xd, "Good Bye!\n\r");
@socket_shutdown($xd, 2);
@socket_close($xd);
?>

wont'tx send "Good Bye!\n\r" to the opened socket.

but if you put a
usleep or something like echo "";
between write and shutdown its working.

webmaster at you-are-infected dot com (23-Aug-2006 06:27)

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 12:43)

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.