Network Функции
PHP Manual

fsockopen

(PHP 4, PHP 5)

fsockopenOpen Internet or Unix domain socket connection

Описание

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 List of Supported Socket Transports. 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().

Параметри

hostname

If you have compiled in OpenSSL support, 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.

Забележка: 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.

Връщани стойности

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

Грешки/Изключения

Throws E_WARNING if hostname is not a valid domain.

Дневник на промените

Версия Описание
4.3.0 Added support for the timeout parameter on win32.
4.3.0 SSL and TLS over TCP/IP support was added.
4.0.0 UDP support was added.

Примери

Example #1 fsockopen() Example

<?php
$fp 
fsockopen("www.example.com"80$errno$errstr30);
if (!
$fp) {
    echo 
"$errstr ($errno)<br />\n";
} else {
    
$out "GET / HTTP/1.1\r\n";
    
$out .= "Host: www.example.com\r\n";
    
$out .= "Connection: Close\r\n\r\n";
    
fwrite($fp$out);
    while (!
feof($fp)) {
        echo 
fgets($fp128);
    }
    
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 />\n";
} else {
    
fwrite($fp"\n");
    echo 
fread($fp26);
    
fclose($fp);
}
?>

Бележки

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

Предупреждение

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.

Забележка: При специфициране на цифров IPv6 адрес (например fe80::1) трябва да оградите IP-то с квадратни скоби. Например, tcp://[fe80::1]:80.

Вж. също


Network Функции
PHP Manual