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;
}
}
?>
socket_write
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_write — Schreibt in einen Socket
Beschreibung
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
lengthkann 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 auffalsezu 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
- socket_accept() - Akzeptiert eine Verbindung an einem Socket
- socket_bind() - Verknüpft einen Socket mit einem Namen
- socket_connect() - Baut eine Verbindung über einen Socket auf
- socket_listen() - Hört einen Socket nach Verbindungsanforderungen ab
- socket_read() - Liest höchstens die angegebene Anzahl Bytes von einem Socket
- socket_strerror() - Gibt einen String zurück, der einen Socket-Fehler beschreibt
add a note
User Contributed Notes 8 notes
revelable at hotmail dot com ¶
13 years ago
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 );
}
}
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.
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";
}
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 ;)
jean at briskula dot si ¶
13 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: $msg");
} else {
return true;
}
}
return false;
}
?>
masterwaster at gmail dot com ¶
16 years ago
Hi,
if you got same problems like i have
<?php
@socket_write($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.
divinity76 at gmail dot com ¶
9 years ago
function AddTCPChecksum(&$data){
//feel free to add some error handling for strlen($data)>65535...
$data=pack("v",strlen($data)).$data;
}
