略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: socket_write

2024-11-15

socket_write

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

socket_write — Write to a socket

说明

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

The function socket_write() writes to the socket from the given data.

参数

socket

data

The buffer to be written.

length

The optional parameter length can specify an alternate length of bytes written to the socket. If this length is greater than the buffer length, it is silently truncated to the length of the buffer.

返回值

Returns the number of bytes successfully written to the socket 或者在失败时返回 false. The error code can be retrieved with socket_last_error(). This code may be passed to socket_strerror() to get a textual explanation of the error.

注意:

It is perfectly valid for socket_write() to return zero which means no bytes have been written. Be sure to use the === operator to check for false in case of an error.

更新日志

版本 说明
8.0.0 现在 socket 是 Socket 实例， 之前是 resource。
8.0.0 length is nullable now.

注释

注意:

socket_write() does not necessarily write all bytes from the given buffer. It's valid that, depending on the network buffers etc., only a certain amount of data, even one byte, is written though your buffer is greater. You have to watch out so you don't unintentionally forget to transmit the rest of your data.

参见

add a noteadd a note

User Contributed Notes 8 notes

up
9
revelable at hotmail dot com
11 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
php at deguest dot asia
7 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
1
gtk at linux dot online dot no
19 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
anonymous
10 months 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
webmaster at you-are-infected dot com
15 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 ;)
up
-5
jean at briskula dot si
11 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;
    }
?>
up
-7
masterwaster at gmail dot com
13 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.
up
-7
divinity76 at gmail dot com
7 years ago
function AddTCPChecksum(&$data){
//feel free to add some error handling for strlen($data)>65535...
$data=pack("v",strlen($data)).$data;
}
add a noteadd a note

官方地址：https://www.php.net/manual/en/function.socket-write.php

有任何技术问题请点击这里 网站运营推广招聘
IT PHP 编程语言 Linux 开发编程 科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库 面试 C/C++ Golang Git 算法 操作系统 正则表达式 Redis 互联网 MySql JavaScript 运维 软件 国际 架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业 硬件 电子 娱乐 设计 nginx 摄影 游戏 WordPress HTTP 团建 数码电器
冷却塔厂家 广告
-- --
php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 Packagist / Composer 中国全量镜像 PHP获取指定函数定义在哪个文件中及行号 PHP mkdir()写出来的权限与mode值不符合 adodb连接mysql多个数据库的问题 php扩展开发
联系我们 半月雨文化 可降解耗材网 蓝云环保 78免费小説 上海网站seo优化 工程造价 币安app官网下载 seo查询
北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3