検索結果の PHP 太字キーワード

<p>function highlighter_text($text, $words){</p><p>    $split_words = explode( " " , $words );</p><p>    foreach($split_words as $word)    {</p><p>        $color = "#4285F4";</p><p>        $text = preg_replace("|($word)|Ui" ,            "<b>$1</b>" , $text );</p><p>    }</p><p>    return $text;</p><p>}</p><p>$string = "I like chocolates and I like apples";$words = "apple";</p><p>echo highlighter_text($string ,$words);</p>