# stream_socket_server

(PHP 5, PHP 7)

stream_socket_server — Create an Internet or Unix domain server socket

### 说明

stream_socket_server ( string `$local_socket` [, int `&$errno` [, string `&$errstr` [, int `$flags` = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN [, resource `$context` ]]]] ) : resource

Creates a stream or datagram socket on the specified `local_socket`.

This function only creates a socket, to begin accepting connections use stream_socket_accept().

### 参数

`local_socket`

  The type of socket created is determined by the transport specified using standard URL formatting: transport://target.

  For Internet Domain sockets (`AF_INET`) such as TCP and UDP, the target portion of the `remote_socket` parameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets, the target portion should point to the socket file on the filesystem.

  Depending on the environment, Unix domain sockets may not be available. A list of available transports can be retrieved using stream_get_transports(). See 所支持的套接字传输器（Socket Transports）列表 for a list of bulitin transports.

`errno`

  If the optional `errno` and `errstr` arguments are present they will be set to indicate the actual system level error that occurred in the system-level socket(), bind(), and listen() calls. If the value returned in `errno` is 0 and the function returned `FALSE`, it is an indication that the error occurred before the bind() call. This is most likely due to a problem initializing the socket. Note that the `errno` and `errstr` arguments will always be passed by reference.

`errstr`

  See `errno` description.

`flags`

  A bitmask field which may be set to any combination of socket creation flags.

  > Note:

  > For UDP sockets, you must use `STREAM_SERVER_BIND` as the `flags` parameter.

`context`

### 返回值

Returns the created stream, or `FALSE` on error.

### 范例

Example #1 Using TCP server sockets

    <?php
    $socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
    if (!$socket) {
      echo "$errstr ($errno)<br />\n";
    } else {
      while ($conn = stream_socket_accept($socket)) {
        fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n");
        fclose($conn);
      }
      fclose($socket);
    }
    ?>

The example below shows how to act as a time server which can respond to time queries as shown in an example on stream_socket_client().

> Note: Most systems require root access to create a server socket on a port below 1024.

Example #2 Using UDP server sockets

    <?php
    $socket = stream_socket_server("udp://127.0.0.1:1113", $errno, $errstr, STREAM_SERVER_BIND);
    if (!$socket) {
        die("$errstr ($errno)");
    }

    do {
        $pkt = stream_socket_recvfrom($socket, 1, 0, $peer);
        echo "$peer\n";
        stream_socket_sendto($socket, date("D M j H:i:s Y\r\n"), 0, $peer);
    } while ($pkt !== false);

    ?>

### 注释

> Note: 当指定数值型的 IPv6 地址（例如 fe80::1）时必须用方括号将 IP 围起来——例如， tcp://[fe80::1]:80。

### 参见

- stream_socket_client() - Open Internet or Unix domain socket connection
- stream_set_blocking() - 为资源流设置阻塞或者阻塞模式
- stream_set_timeout() - Set timeout period on a stream
- fgets() - 从文件指针中读取一行
- fgetss() - 从文件指针中读取一行并过滤掉 HTML 标记
- fwrite() - 写入文件（可安全用于二进制文件）
- fclose() - 关闭一个已打开的文件指针
- feof() - 测试文件指针是否到了文件结束的位置
- Curl extension