Delete empty lines in the file and save it

Empt.php

<?php

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

namespace sutlxwhx;

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

    /**
     * Empt constructor.
     *
     * @param $path_to_the_file Absolute path to the file that will be processed
     */
    public function __construct($path_to_the_file)
    {
        $this->path = $path_to_the_file;
        if ($this->validate($this->path) == true) {
            return $this->result = $this->process($this->path);
        } else {
            return $this->result = "File you've mentioned doesn't exists or is not writable.";
        }
    }

    /**
     *  Check the availability of the input file using ternary operators
     */
    private function validate()
    {
        return file_exists($this->path) AND is_readable($this->path) ? true : false;
    }

    /**
     * Specify the filtering process
     * @return bool Status - success or failure
     */
    private function process()
    {
        if(is_file($this->path)){
            if(is_readable($this->path)){
                if(is_writable($this->path)){
                    $file_data = file_get_contents($this->path);
                    $file_data = preg_replace("#\n\r\n#", "", $file_data);
                    $file_data = preg_replace("#\n\n#", PHP_EOL, $file_data);
                    file_put_contents($this->path, $file_data, LOCK_EX);
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }
        else {
            return false;
        }
    }
}

/**
 *  Initialise Empt class and set the necessary parameter
 *  Dump the result element of an object
 */
/* $empt_worker = new Empt(__DIR__ . DIRECTORY_SEPARATOR . 'test.txt'); */
/* var_dump($empt_worker->result); */