socket_write
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_write — 向套接字写数据
说明
函数 socket_write() 向 socket
写入 data。
参数
socket-
data-
要写入到缓冲区的数据。
length-
可选参数
length可以指定写入 socket 的字节长度。如果写入的字节长度大于data的长度，默认将被截取为data长度。
返回值
返回成功写入 socket 的字节数 或者在失败时返回 false。可以通过调用 socket_last_error()
来检索实际的错误码。将错误码作为参数传递给 socket_strerror() 以获得错误的文本解释。
注意:
对于 socket_wirte() 来说返回 0 是完全有效的，这代表没有字节被写入。如果发生错误，务必使用
===运算符来判断是否为false。
注释
注意:
socket_write() 不一定会写入
data的所有字节。根据网络缓冲区等因素，即使data较长，也可能只写入部分数据，甚至是一个字节。必须使用循环来确保已完整传输剩余data。
参见
- socket_accept() - 接受套接字上的连接
- socket_bind() - 给套接字绑定名字
- socket_connect() - 开启一个套接字连接
- socket_listen() - 监听套接字的连接
- socket_read() - 从套接字中读取最大长度的数据
- socket_strerror() - 返回描述套接字错误的字符串
＋添加备注
用户贡献的备注 5 notes
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;
}
}
?>
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";
}
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.
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() ) . $e->getMessage();
return( false );
}
}
webmaster at you-are-infected dot com ¶
18 years ago
If you connect to a Server in a way like you do with telnet or some similar protokoll you may have problems with sending data to the server. I found out that at some servers there is a different between:
<?php
socket_write ($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 ;)备份地址：http://www.lvesu.com/blog/php/function.socket-write.php