Koala Framework delete unuseful uploads

CleanfilesControllerController.php

<?php
class Cli_CleanfilesControllerController extends Kwf_Controller_Action {
    public function indexAction() {

        //set memory and time for script
        ini_set('memory_limit', "768M");
        set_time_limit(600);

        //show current dir
        echo "\nYour current directory: " . getcwd();

        //full path to uploads folder
        $dir = getcwd() . "/uploads/";
        //show uploads path
        echo "\nUploads folder: " . $dir;


        $db = Kwf_Registry::get('db');

        //select all keys without relations
        $sql = 'SELECT id
        FROM kwf_uploads AS u
        WHERE NOT EXISTS     (SELECT NULL FROM documents WHERE u.id = picture_id )
              AND NOT EXISTS (SELECT NULL FROM books WHERE u.id = file_id )
              AND NOT EXISTS (SELECT NULL FROM employee WHERE u.id = picture_id )
              AND NOT EXISTS (SELECT NULL FROM flightFiles WHERE u.id = file_id )
              AND NOT EXISTS (SELECT NULL FROM tasks WHERE u.id = picture_id )
              AND NOT EXISTS (SELECT NULL FROM trainingContentQuestions WHERE u.id = picture_id )
              AND NOT EXISTS (SELECT NULL FROM trainingQuestions WHERE u.id = picture_id )';
        //get all rows
        $fileRows = $db->query($sql)->fetchAll();


        if (count($fileRows) > 0) {

            echo "\n\nRows count: " . count($fileRows);

            $fileRowsMap = array_map(function($el) { return $el['id']; }, $fileRows);
            $fileRowsStr = implode(',', $fileRowsMap);

            //show string with ids to delete
            echo "\nRows string: " . "\n" . $fileRowsStr . "\n";

            //delete each file
            foreach ($fileRows as $file) {

                echo "\nDB row " . $file['id'];

                if (file_exists($dir . $file['id'])) {
                    echo "\nFile exists.";

        			if(unlink($dir . $file['id']))	{
        				echo "\nFile " . $file['id'] . " deleted successfully!" . PHP_EOL;
        			}
        			else {
        				echo "\nError. File " . $file['id'] . "not removed. " . PHP_EOL;
        			}

                } else {
                    echo "\nFile does not exists." . PHP_EOL;
                }
            }

            //delete rows from DB
            $sql='DELETE FROM kwf_uploads WHERE id IN (' . $fileRowsStr . ')';
            $db->query($sql);

        }


    }

}