PHP加粗搜索结果中关键字

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