Simple words scanner class in PHP

WordsScanner.php

<?php
    $needleWords = 'work,hard,learn';

    $text = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris ,work, nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in hard, culpa qui officia deserunt mollit anim id est laborum.';

    $scanner = new WordsScanner($needleWords,$text);
    $scanner->scanText();

    class WordsScanner {

        private $words;
        private $text;

        public function __construct($words,$text){
            $this->words = $words;
            $this->text = $text;
        }

        public function wordsToArray(){
            $words = explode(',',$this->words);
            return $words;
        }

        public function reCheck($word){
            $bannedWords = $this->wordsToArray();
            return in_array($word,$bannedWords);
        }

        public function wordFound($word){
            //You can alert someone
            echo sprintf('Word found: %s',$word).PHP_EOL;
        }

        public function scanText(){
            $bannedWords = $this->wordsToArray();
            foreach($bannedWords as $word){
                if(strpos($this->text, $word) ){
                    if($this->reCheck($word)){
                        $this->wordFound($word);
                    }
                }
            }
        }

    }