PHP Extension

Check if an FTP Listing Entry is a Symbolic Link

Demonstrates the Chilkat Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing entry is a symbolic link. The only argument is a zero-based index. This information is available only when the server's listing format reports it.

Background: Symbolic links matter because following one can lead outside the expected directory or into a cycle, so recursive operations often need to identify and skip them. Unlike the file/directory distinction, symlink information is not always present — only listing formats that mark links (typically Unix-style LIST output) expose it, and this returns false when the server does not.

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<?php

include("chilkat.php");

$success = false;

//  Demonstrates the Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing
//  entry is a symbolic link.  The only argument is a zero-based index.  This information is only
//  available when the server's listing format reports it.

$ftp = new CkFtp2();

$ftp->put_Hostname('ftp.example.com');
$ftp->put_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->put_Password('myPassword');

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

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

//  GetDirCount retrieves the directory listing on the first call and returns the number of
//  entries.  A negative return indicates failure.
$n = $ftp->GetDirCount();
if ($n < 0) {
    print $ftp->lastErrorText() . "\n";
    exit;
}

for ($i = 0; $i <= $n - 1; $i++) {
    $name = $ftp->getFilename($i);
    if ($ftp->GetIsSymbolicLink($i)) {
        print '[LINK] ' . $name . "\n";
    }
    else {
        print '       ' . $name . "\n";
    }

}

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


?>