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    socket_write

    (PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

    socket_write — Escribir en un socket

    Descripción

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

    La función socket_write() escribe en el socket desde el buffer dado.

    Parámetros

    socket

    buffer

    El buffer a ser escrito.

    length

    El parámetro opcional length puede especificar una longitud alternativa de bytes escritos en el socket. Si esta longitud es mayor que la longitud del buffer se trunca de forma silenciosa a la longitud del buffer.

    Valores devueltos

    Devuelve el número de bytes escritos con éxito en el socket o false en caso de error. El código de error se puede recuperar con socket_last_error(). Este código se puede pasar a socket_strerror() para obtener una explicación textual del error.

    Nota:

    Es perfectamente válido que socket_write() devuelva cero, lo que significa que no se han escrito bytes. Asegúrese de usar el operador === para verificar false en caso de un error.

    Notas

    Nota:

    socket_write() no escribe necesariamente todos los bytes desde el buffer dado. Esto es válido ya que depende de los búferes de red, etc., sólo se escribe una cierta cantidad de informaicón, incluso un byte, aunque su buffer sea mayor. Debe tener cuidado de no olvidar inintencionadamente de transmitir el resto de la información.

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    User Contributed Notes 5 notes

    up
    8
    revelable at hotmail dot com
    13 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
    1
    anonymous
    3 years ago
    sending a few mbs or more results in incomplete transfers, send data in a loop and chunks instead, socket_write reports complete write even though it is only a partial transfer, possibly because of buffer overrun somewhere.

    $strlen=strlen($msg);
    $totaltransferred=0;

    $blocksize=10000;
    for ($a=0;$a<$strlen;$a+=$blocksize){
    $part=substr($msg,$a,$blocksize);
    $transferred=socket_write($socket,$part,strlen($part));
    $totaltransferred+=$transferred;
    }

    if ($totaltransferred<$strlen){
    echo "incomplete transfer";
    }
    up
    2
    gtk at linux dot online dot no
    22 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
    1
    php at deguest dot asia
    9 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
    -3
    webmaster at you-are-infected dot com
    18 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 ;)
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