which one is better/faster? If all I want is the second field "date" from $file?

$file = "file_statistics.2007-02-01T13:24:40-08:00.data.gz";
list( , $date, , ) = explode(".", $data);

vs

$file = "file_statistics.2007-02-01T13:24:40-08:00.data.gz";
$fileInfo = explode ( ".", $file );