PHP

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

use Chilkat2\Ftp2;

// 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 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';

try {
    $ftp->Connect();

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

// Only enable compression if the server advertises MODE Z support.
if ($ftp->HasModeZ) {
    try {
        $ftp->SetModeZ();
    } catch (\Chilkat2\Exception $e) {
        echo $e->getMessage(), "\n";
        exit;
    }

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

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

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