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    socket_write

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

    socket_write — Schreibt in einen Socket

    Beschreibung

    socket_write(Socket $socket, string $data, ?int $length = null): int|false

    Die Funktion socket_write() schreibt aus dem Puffer data in den Socket socket.

    Parameter-Liste

    socket

    data

    Der Puffer, dessen Inhalt geschrieben werden soll.

    length

    Mit dem optionalen Parameter length kann man alternativ eine Anzahl von Bytes angeben, die in den Socket geschrieben werden sollen. Falls diese Anzahl größer ist, als der Puffer, wird sie stillschweigend auf die Puffergröße gekürzt.

    Rückgabewerte

    Gibt die Anzahl der erfolgreich in den Socket geschriebenen Bytes zurück. Bei einem Fehler wird false zurückgegeben.. Der Fehlercode kann mit der Funktion socket_last_error() ermittelt werden. Dieser Fehlercode kann an die Funktion socket_strerror() übergeben werden, um eine textuelle Beschreibung des Fehlers zu erhalten.

    Hinweis:

    Es ist durchaus möglich, dass socket_write() den Wert 0 zurckgibt, was bedeutet, dass kein einziges Byte geschrieben wurde. Vergewissern Sie sich, dass Sie den Operator === benutzen, um im Falle eines Fehlers auf false zu testen.

    Changelog

    Version Beschreibung
    8.0.0 socket ist nun eine Socket-Instanz; vorher war es eine resource.
    8.0.0 length ist nun ein Nullable-Typ.

    Anmerkungen

    Hinweis:

    socket_write() schreibt nicht notwendigerweise alle Bytes aus dem angegebenen Puffer. Es ist auch möglich, dass, abhängig von den Puffern im Netzwerk usw., nur eine bestimmte Datenmenge, sogar auch nur ein Byte, geschrieben wird, obwohl der Puffer größer ist. Dies müssen Sie beobachten, damit Sie nicht versehentlich versäumen, den Rest Ihrer Daten zu senden.

    Siehe auch

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    User Contributed Notes 5 notes

    up
    8
    revelable at hotmail dot com
    14 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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