PHP

FTP Socket Buffer and Address Options

Demonstrates the SoRcvBuf, SoSndBuf, PreferIpv6, and ClientIpAddress properties.

Background: These are low-level knobs for specific situations. Larger send/receive buffers can improve throughput on high-bandwidth, high-latency links, though the defaults suit the common case. PreferIpv6 only matters when a hostname resolves to both address families, choosing which to try first. ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing connection to a particular local interface. Change any of these only with a concrete reason.

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<?php

use Chilkat2\Ftp2;

$ftp = new Ftp2();

$ftp->Hostname = 'ftp.example.com';
$ftp->Username = 'myFtpLogin';

// SoRcvBuf and SoSndBuf set the TCP socket receive/send buffer sizes.  The defaults are tuned for
// the common case; larger values can sometimes help throughput on high-latency links.
$ftp->SoRcvBuf = 4194304;
$ftp->SoSndBuf = 524288;

// PreferIpv6 (default false) chooses IPv6 over IPv4 when a hostname resolves to both.
$ftp->PreferIpv6 = false;

// ClientIpAddress is normally left unset; set it on a multihomed host to bind the outgoing
// connection to a specific local interface.
$ftp->ClientIpAddress = '192.168.1.50';

// Normally you would not hard-code the password in source.  You should instead obtain it
// from an interactive prompt, environment variable, or a secrets vault.
$ftp->Password = 'myPassword';

try {
    $ftp->Connect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "Connected with custom socket options.\n";

try {
    $ftp->Disconnect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}