stream_socket_client()

(PHP 5, PHP 7)

Open Internet or Unix domain socket connection

说明

stream_socket_client(string $remote_socket[,int &$errno[,string &$errstr[,float $timeout= ini_get("default_socket_timeout")[,int $flags= STREAM_CLIENT_CONNECT[,resource $context]]]]]): resource

Initiates a stream or datagram connection to the destination specified by$remote_socket. The type of socket created is determined by the transport specified using standard URL formatting:transport://target. For Internet Domain sockets (AF_INET) such as TCP and UDP,thetargetportion of the$remote_socketparameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets,the$targetportion should point to the socket file on the filesystem.

Note:

The stream will by default be opened in blocking mode. You can switch it to non-blocking mode by usingstream_set_blocking().

参数

$remote_socket

Address to the socket to connect to.

$errno

Will be set to the system level error number if connection fails.

$errstr

Will be set to the system level error message if the connection fails.

$timeout

Number of seconds until theconnect()system call should timeout.Note:This parameter only applies when not making asynchronous connection attempts.

Note:

To set a timeout for reading/writing data over the socket, use thestream_set_timeout(), as the$timeoutonly applies while making connecting the socket.

$flags

Bitmask field which may be set to any combination of connection flags. Currently the select of connection flags is limited toSTREAM_CLIENT_CONNECT(default),STREAM_CLIENT_ASYNC_CONNECTandSTREAM_CLIENT_PERSISTENT.

$context

A valid context resource created withstream_context_create().

返回值

On success a stream resource is returned which may be used together with the other file functions (such asfgets(),fgetss(),fwrite(),fclose(),andfeof()),FALSEon failure.

错误／异常

On failure the$errnoand$errstrarguments will be populated with the actual system level error that occurred in the system-levelconnect()call. If the value returned in$errnois0and the function returnedFALSE, it is an indication that the error occurred before theconnect()call. This is most likely due to a problem initializing the socket. Note that the$errnoand$errstrarguments will always be passed by reference.

范例

Example #1stream_socket_client()example

Using UDP connection

Retrieving the day and time from the UDP service "daytime"(port 13) on localhost.

注释

Warning

UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data.

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。

Note:

Depending on the environment, the Unix domain or the optional connect timeout may not be available. A list of available transports can be retrieved usingstream_get_transports().See所支持的套接字传输器（Socket Transports）列表for a list of built in transports.

参见

• stream_socket_server()Create an Internet or Unix domain server socket
• 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
• stream_select()Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by tv_sec and tv_usec
• 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 函数

For those wanting to use stream_socket_client() to connect to a local UNIX socket who can't find documentation on how to do it, here's a (rough) example: 

If you only need to check a stream for data, you can use stream_get_content and strtr function. stream_get_content 
reads the remainder of a stream into a string. 

# Some may find it useful to know that your caCert 
# must be in pem format, and that PHP seems to like 
# your key, cert, and cacert pem's to be concatenated
# in a single file (I suffered various "unknown chain" 
# errors, otherwise)
#
# So, (linux users), concat your components as follows:
# (where current working dir is dir where 
# cert components are stored)
#
# cat key.pem >certchain.pem
# cat cert.pem >>certchain.pem
# cat cacert.pem >>certchain.pem
#
# Then, the php....
################################## 

stream_socket_client is much easier and faster to use to direct sockets, because you can use directly fwrite / fget / fclose functions, but I find hard to find how to connect to a UNIX domain socket. The URL to use is "udg:///path/to/socket".
For example, to log to the log socket (like syslog), you can use: 

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