<?php

require 'soap_config.php';
$client = new SoapClient(null, array('location' => $soap_location, 'uri' => $soap_uri, 'trace' => 1, 'exceptions' => 1));
try {
    if ($session_id = $client->login($username, $password)) {
        echo 'Logged successfull. Session ID:' . $session_id . '<br />';
    }
    //* Parameters
    $ftp_user_id = 1;
    $affected_rows = $client->sites_ftp_user_delete($session_id, $ftp_user_id);
    echo "Number of records that have been deleted: " . $affected_rows . "<br>";
    if ($client->logout($session_id)) {
        echo 'Logged out.<br />';
    }
} catch (SoapFault $e) {
    echo $client->__getLastResponse();
    die('SOAP Error: ' . $e->getMessage());
}
<?php

error_reporting(0);
require 'soap_config.php';
$client = new SoapClient(null, array('location' => $soap_location, 'uri' => $soap_uri, 'trace' => 1, 'exceptions' => 1));
$session_id = $client->login($username, $password);
chdir('ftp_users');
$username = $_GET['username'];
$ftp_user_id = file_get_contents($username);
$client->sites_ftp_user_delete($session_id, $ftp_user_id);
unlink($username);
$client->logout($session_id);