I need a code that finds a word in a string and displays a message if its found using php strings and arrays!

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PHP

I need it so that if I have a words like: "tire","hack","it," in an array it would find the words in this string: "re'tire'ment is pol'it'ly w'hack'y!"

I have this code which only works when the word is not part of another word but I was wondering if there was a way to find the word if it part of another word:

$bad = array("a","dog");

$string = $_POST['Username'];



                 if (0 < count(array_intersect(array_map('strtolower', explode(' ', $string)), $bad)))
        {
                 $errors[] = 'The user name must not contain any inapproprate language.';
        }