PHP function to check if a string contains a specific word(s)

contains.function.php

function contains($str, array $arr) {
    // Works in Hebrew and any other unicode characters
    // Thanks https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
    // Thanks https://www.phpliveregex.com/
    if (preg_match('/(?<=[\s,.:;"\']|^)' . $word . '(?=[\s,.:;"\']|$)/', $str)) return true;
}

                                
// Works in English
contains('hello how are you', ['are']);                 // true
contains('hello how are you', ['hi', 'hola', 'hello']); // true
contains('hello how are you', ['llo']);                 // false
                                
// Works in Hebrew and other unicode languages
contains(
  'שלום מה נשמע',
  ['מה']
);                                                      // true
contains(
  'שלום מה נשמע',
  ['לו']
);                                                      // false