php > $line = "[30] NBA - nba";
php > echo $line;
[30] NBA - nba
php > preg_match("/\[(\d+)\]/", $line, $matches);
php > var_dump($matches);
array(2) {
  [0]=>
  string(4) "[30]"
  [1]=>
  string(2) "30"
}
php >