PHP ActiveX

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

$success = 0;

$ftp = new COM("Chilkat.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 0) chooses IPv6 over IPv4 when a hostname resolves to both.
$ftp->PreferIpv6 = 0;

//  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';

$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}

print 'Connected with custom socket options.' . "\n";

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}


?>