<?php

$a = 'https://play.google.com/store/apps/details'.
     '?id=com.microsoft.office.officehub';
//https linklerde patlayabilir. curl kullan.
$b = file_get_contents($a);
$c = '#class\=\"score\".*?\>(.*?)\<\/div\>#si';
$d = preg_match($c, $b, $e) ? $e[1] : '';
var_dump($d);
/*çıktı:
C:\Users\Saintx\Documents\Workspace\play.php:9:
string(3) "4,0"
*/