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socket_write

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

socket_writeソケットに書き込む

説明

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

関数 socket_write() は、 buffer の内容をソケット socket に書き込みます。

パラメータ

socket

buffer

書き込まれるバッファ。

length

オプションのパラメータ length で、 ソケットに書き込むバイト数を指定することが可能です。 この値がバッファの長さより大きい場合、自動的にバッファのサイズに切り詰められます。

返り値

ソケットへの書き込みに成功したデータのバイト数を返します。失敗した場合に FALSE を返します。 エラーコードは socket_last_error() を用いて取得することができ、この値を socket_strerror() に渡すことでエラー情報を文字列で取得可能です。

注意:

socket_write() がゼロを返すことも十分ありえます。 これは、書き込むデータが存在しなかったことを意味します。 エラーをチェックするために FALSE かどうかを調べる際には、必ず === 演算子を使用しましょう。

注意

注意:

socket_write() は、バッファの内容を必ずしもすべて 書き込むとは限りません。ネットワークバッファの状態にもよりますが、 たとえ 1 バイトだけ書き込まれたのであったとしても、それはエラーではなく正常な動作です。 そのため、データがすべて書き込まれたのかどうかに注意する必要があります。

参考

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User Contributed Notes 7 notes

up
5
revelable at hotmail dot com
8 years ago
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;
        }
           
    }
?>
up
3
gtk at linux dot online dot no
17 years ago
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.
up
2
php at deguest dot asia
4 years ago
I often read in php docs users not checking for the php function returned value, and in the case of socket_write, I could not see here in the comment anyone botering to read on the socket the server reply.
Then one user thought it would be a good idea to use usleep after a socket_write on a smtp connection.
Actually, if you check the server reply, not only will it give time for the server to reply before you write again on the socket, but also this is a great opportunity to check what the server replied you.
For instance, for smtp connection :
In this example MAIL_SERVER, MAIL_PORT and DEBUG are constants I defined.
<?php
function sendmail( $param )
{
   
$from    = &$param[ 'from' ];
   
$to      = &$param[ 'to' ];
   
$message = &$param[ 'data' ];
   
   
$isError = function( $string )
    {
        if(
preg_match( '/^((\d)(\d{2}))/', $string, $matches ) )
        {
            if(
$matches[ 2 ] == 4 || $matches[ 2 ] == 5 ) return( $matches[ 1 ] );
        }
        else
        {
            return(
false );
        }
    };
   
    try
    {
       
$socket = null;
        if( (
$socket = socket_create( AF_INET, SOCK_STREAM, SOL_TCP ) ) == false )
        {
            throw new
Exception( sprintf( "Unable to create a socket: %s", socket_strerror( socket_last_error() ) ) );
        }
        if( !
socket_connect( $socket, MAIL_SERVER, MAIL_PORT ) )
        {
            throw new
Exception( sprintf( "Unable to connect to server %s: %s", MAIL_SERVER, socket_strerror( socket_last_error() ) ) );
        }
       
$read = socket_read( $socket, 1024 );
        if(
$read == false )
        {
            throw new
Exception( sprintf( "Unable to read from socket: %s", socket_strerror( socket_last_error() ) ) );
        }
       
        if(
socket_write( $socket, sprintf( "HELO %s\r\n", gethostname() ) ) === false )
        {
            throw new
Exception( sprintf( "Unable to write to socket: %s", socket_strerror( socket_last_error() ) ) );
        }
       
$read = socket_read( $socket, 1024 );
        if(
$read == false )
        {
            throw new
Exception( sprintf( "Unable to read from socket: %s", socket_strerror( socket_last_error() ) ) );
        }
        else
        {
            if( (
$errCode = $isError( $read ) ) ) throw new Exception( "Server responded with an error code $errCode" );
        }
       
        if(
socket_write( $socket, sprintf( "MAIL FROM: %s\r\n", $from ) ) === false )
        {
            throw new
Exception( sprintf( "Unable to write to socket: %s", socket_strerror( socket_last_error() ) ) );
        }
       
$read = socket_read( $socket, 1024 );
        if(
$read == false )
        {
            throw new
Exception( sprintf( "Unable to read from socket: %s", socket_strerror( socket_last_error() ) ) );
        }
        else
        {
            if( (
$errCode = $isError( $read ) ) ) throw new Exception( "Server responded with an error code $errCode" );
        }
       
/* And some more code, but not enough place in comment */
       
return( $totalWriten );
    }
    catch(
Exception $e )
    {
       
$ERROR = sprintf( "Error sending mail message at line %d. ", $e->getLine() ) . $e->getMessage();
        return(
false );
    }
}
up
0
webmaster at you-are-infected dot com
13 years ago
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 ;)
up
-5
jean at briskula dot si
8 years ago
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;
    }
?>
up
-5
masterwaster at gmail dot com
11 years ago
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.
up
-6
divinity76 at gmail dot com
4 years ago
function AddTCPChecksum(&$data){
//feel free to add some error handling for strlen($data)>65535...
$data=pack("v",strlen($data)).$data;
}
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