PHP fsockopen() function usage and examples

PHP HTTP Reference Manual

The fsockopen() function opens a network connection or a Unix socket connection.

Syntax

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

Definition and Usage

It is used to open Internet or Unix domain socket connections.

Initialize a socket connection to a specified host (hostname).
PHP supports the following list of socket transport types: The list of supported socket transports (Socket Transports). You can also obtain the supported types of socket transports by using stream_get_transports().
By default, the socket connection will be opened in blocking mode. Of course, you can change it to non-blocking mode by stream_set_blocking().
stream_socket_client() is very similar and provides more rich parameter settings, including non-blocking mode and context settings.

Return value

　fsockopen() returns a file handle that can be used by other file class functions (such as fgets(), fgetss(), fwrite(), fclose(), and feof()). If the call fails, it will return FALSE.

Note: If the hostname is inaccessible, a warning-level (E_WARNING) error message will be thrown.

Parameter

Online Example

Try the following example

<?php
　　　$connection = fsockopen("www.w"3codebox.com",　80, $errno, $errstr,　30);
　　　
　　　if (!$connection) {
　　　　　　echo "$errstr ($errno"
　　　　　　\n"
　　　} else {
　　　　　　$out = "GET"　/　HTTP/1.1\r\n"
　　　　　　$out .= "Host: www.w"3codebox.com\r\n";
　　　　　　$out .= "Connection: Close\r\n\r\n";
　　　　　　
　　　　　　fwrite($connection, $out);
　　　　　　
　　　　　　while (!feof($connection)) {
　　　　　　　　　echo fgets($connection,　128);
　　　　　　}
　　　　　　fclose($connection);
　　　}
?>

The example above opens a connection

PHP HTTP Reference Manual