PHP ActiveX

Enable FTP MODE Z Compression

Demonstrates the Chilkat Ftp2.SetModeZ method, which enables MODE Z compression for subsequent data connections. It takes no arguments. Call it after connecting and only when the HasModeZ property is true.

Background: MODE Z compresses data on the fly (using zlib) as it crosses the wire, which can meaningfully speed up transfers of compressible content — text, HTML, logs — over a slow link. It is a server extension, so check HasModeZ first and expect it to be unavailable on many servers. There is little benefit for already-compressed data such as images or archives, where the CPU cost of compression buys almost nothing.

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<?php

$success = 0;

//  Demonstrates the Ftp2.SetModeZ method, which enables MODE Z compression for subsequent data
//  connections.  It takes no arguments.  Call it after connecting, and only when the HasModeZ
//  property indicates the server supports it.

$ftp = new COM("Chilkat.Ftp2");

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

//  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;
}

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

//  Only enable compression if the server advertises MODE Z support.
if ($ftp->HasModeZ) {
    $success = $ftp->SetModeZ();
    if ($success == 0) {
        print $ftp->LastErrorText . "\n";
        exit;
    }

    print 'MODE Z compression enabled.' . "\n";
}
else {
    print 'The server does not support MODE Z.' . "\n";
}

//  Subsequent uploads, downloads, and listings are transferred compressed.

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


?>