Grap imdb ratings

Question

I'm trying to use this simple get_data code:

https://davidwalsh.name/php-imdb-information-grabber

but I don't know how to get rating points. E.g. 7.4 (I want to leave stars and voters etc off)

I have trying this but it shows all results, title, plot etc... (Not working correctly).

 $ratings = get_match('/<div class="ratingValue">(.*?)<\/div>/isU',$imdb_content);