Copy specified files to the new directory

Copier.php

<?php

/**
 * @author https://gist.github.com/sutlxwhx
 *
 * @version 0.2
 *
 * @license Apache License 2.0
 *
 */

namespace sutlxwhx;

class Copier
{
    /**
     * @var string Set the property that will store the result
     */
    public $result;

    /**
     * @var string Set the absolute path to the current folder
     */
    private $current_folder = __DIR__ . DIRECTORY_SEPARATOR;

    /**
     * Copier constructor.
     *
     * @param $filename Name of the input file
     */
    public function __construct($filename, $level_of_details)
    {
        $this->filename = $filename;
        $this->level = $level_of_details;
        if ($this->validate() == true) {
            return $this->result = $this->process();
        } else {
            if ($this->level) {
                return $this->result = "I was unable to validate your input file or desired output folder. Check if this script has neccessary writing permissions and your input file exists." . PHP_EOL;
            } else {
                return $this->result = false;
            }

        }

    }

    /**
     *  Check if this script has necessary writing permissions
     *  Check if the necessary file and folder exists
     */
    private function validate()
    {
        if (!is_writable($this->current_folder)) {
            return false;
        }
        if (file_exists($this->current_folder . $this->filename)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     *  Specify the copy process
     */
    private function process()
    {
        $current = file($this->current_folder . $this->filename);
        foreach ($current as $file) {
            $file_data = explode(',', $file);
            $current_file = trim($file_data[0]);
            $new_folder = trim($file_data[1]);
            $new_folder = $this->current_folder . $new_folder . DIRECTORY_SEPARATOR;
            if (!file_exists($new_folder)) {
                mkdir($new_folder, 0755, true);
            }
            $desired = $new_folder . $current_file;
            if (!file_exists($current_file)) {
                if ($this->level) {
                    print "$current_file is missing!" . PHP_EOL;
                }
                continue;
            }
            copy($this->current_folder . $current_file, $desired);
        }
        if ($this->level) {
            print "Copying process is complete." . PHP_EOL;
        }
        return true;
    }
}

/**
 *  State the name of the list of your files and the name of the directory where you want to put them
 *  In your input.txt you need to use *.csv format
 *
 *  Each file must start with a new line and data field must be separated with a comma, for example:
 *  aaa.txt,directory1
 *  bbb.dat,directory2
 *  ...
 *  n.php,directoryn
 *
 *  The directory must be in the current folder where you run this script
 */
/* $copier_worker = new Copier('test.txt', false); */
/* var_dump($copier_worker->result); */