PHP ActiveX

Pre-Allocate Server Space Before an FTP Upload (ALLO)

Demonstrates the AllocateSize property, which sends the FTP ALLO command to pre-allocate disk space on the server before an upload. Set it to the size in bytes of the file about to be uploaded.

Background: ALLO asks the server to reserve storage in advance, a requirement of certain legacy systems — older mainframes in particular — that need the exact file size up front to allocate a dataset. Modern servers allocate space dynamically and typically ignore or accept ALLO without needing it, so most applications never set this. Provide it only when targeting a host known to require pre-allocation.

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<?php

$success = 0;

$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;
}

//  AllocateSize sends the FTP ALLO command to pre-allocate disk space on the server before an
//  upload.  It is rarely needed -- mainly for certain legacy systems that require the exact size
//  in advance -- since most servers allocate space dynamically.  Set it to the size in bytes of
//  the file about to be uploaded.
ERROR: Assignment type mismatch.  ExpressionType=int, atgType=uint

$success = $ftp->PutFile('qa_data/bigfile.zip','uploads/bigfile.zip');
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}

print 'Uploaded with pre-allocation.' . "\n";

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


?>