fsockopen

(PHP 4, PHP 5)

fsockopen — Open Internet or Unix domain socket connection

说明

resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )

Initiates a socket connection to the resource specified by hostname.

PHP supports targets in the Internet and Unix domains as described in 所支持的套接字传输器（Socket Transports）列表. A list of supported transports can also be retrieved using stream_get_transports().

The socket will by default be opened in blocking mode. You can switch it to non-blocking mode by using stream_set_blocking().

参数

hostname

If OpenSSL support is installed, you may prefix the hostname with either ssl:// or tls:// to use an SSL or TLS client connection over TCP/IP to connect to the remote host.

port

The port number.

errno

If provided, holds the system level error number that occurred in the system-level connect() call.

If the value returned in errno is 0 and the function returned FALSE, it is an indication that the error occurred before the connect() call. This is most likely due to a problem initializing the socket.

errstr

The error message as a string.

timeout

The connection timeout, in seconds.

Note:

If you need to set a timeout for reading/writing data over the socket, use stream_set_timeout(), as the timeout parameter to fsockopen() only applies while connecting the socket.

返回值

fsockopen() returns a file pointer which may be used together with the other file functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()). If the call fails, it will return FALSE

错误/异常

Throws E_WARNING if hostname is not a valid domain.

更新日志

版本	说明
4.3.0	Added support for the `timeout` parameter on win32.
4.3.0	SSL and TLS over TCP/IP support was added.

范例

Example #1 fsockopen() Example


<?php
$fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />
";
} else {
    $out = "GET / HTTP/1.1
";
    $out .= "Host: www.example.com
";
    $out .= "Connection: Close

";
    fwrite($fp, $out);
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
    fclose($fp);
}
?>

Example #2 Using UDP connection

The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine.


<?php
$fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr);
if (!$fp) {
    echo "ERROR: $errno - $errstr<br />
";
} else {
    fwrite($fp, "
");
    echo fread($fp, 26);
    fclose($fp);
}
?>

注释

Note:

Depending on the environment, the Unix domain or the optional connect timeout may not be available.

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.