socket_strerror
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)
socket_write — Escribir en un socket
Descripción
int socket_write
( resource
$socket
, string $buffer
[, int $length = 0
] )
La función socket_write() escribe en el
socket desde el
buffer dado.
Parámetros
-
socket -
-
buffer -
El buffer a ser escrito.
-
length -
El parámetro opcional
lengthpuede especificar una longitud alternativa de bytes escritos en el socket. Si esta longitud es mayor que la longitud del buffer se trunca de forma silenciosa a la longitud del buffer.
Valores devueltos
Devuelve el número de bytes escritos con éxito en el socket o FALSE en caso de error.
El código de error se puede recuperar con
socket_last_error(). Este código se puede
pasar a socket_strerror() para obtener una explicación textual del
error.
Nota:
Es perfectamente válido que socket_write() devuelva cero, lo que significa que no se han escrito bytes. Asegúrese de usar el operador === para verificar
FALSEen caso de un error.
Notas
Nota:
socket_write() no escribe necesariamente todos los bytes desde el buffer dado. Esto es válido ya que depende de los búferes de red, etc., sólo se escribe una cierta cantidad de informaicón, incluso un byte, aunque su buffer sea mayor. Debe tener cuidado de no olvidar inintencionadamente de transmitir el resto de la información.
Ver también
- socket_accept() - Acepta una conexión de un socket
- socket_bind() - Vincula un nombre a un socket
- socket_connect() - Inicia una conexión sobre un socket
- socket_listen() - Escucha una conexión sobre un socket
- socket_read() - Lee un máximo de longitud de bytes desde un socket
- socket_strerror() - Devuelve una cadena que describe un error de socket
add a note
User Contributed Notes
socket_write - [6 notes]
revelable at hotmail dot com ¶
2 years ago
jean at briskula dot si ¶
2 years ago
Some clients (Flash's XMLSocket for example) won't fire a read event until a new line is recieved.
<?php
/*
* Write to a socket
* add a newline and null character at the end
* some clients don't read until new line is recieved
*
* try to send the rest of the data if it gets truncated
*/
function write(&$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;
}
?>
slyv at poczta dot onet dot pl ¶
4 years ago
"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: $errormsg";
} else {
// Data sent ok
}
?>
masterwaster at gmail dot com ¶
4 years ago
Hi,
if you got same problems like i have
<?php
@socket_write($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.
gtk at linux dot online dot no ¶
10 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.
webmaster at you-are-infected dot com ¶
6 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 ;)