PHP fsockopen Functions

[Japesh]

fsockopen — Open Internet or Unix domain socket connection

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

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().

[Feoras]

By default php.ini set the user_agent to “PHP” which signifies that it’s the script that try to access the web server. Some web servers will refuse and don’t allow script to access and receive the date from the server.

[MACAWI]

sockopen() 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

fsockopen() Example

<?php
$fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);
if (!$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($fp, 128);
    }
    fclose($fp);
}
?>

[Maceo]

fsockopen() Using UDP connection

<?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($fp, 26);
    fclose($fp);
}
?>