私はこの $countries 配列を持っています:
Array ( [0] => 2013 Germany [1] => country [2] => Berlin [3] => Beer)
Array ( [0] => 2012 Italy [1] => country [2] => Rome [3] => Wine )
Array ( [0] => 2013 Germany [1] => country [2] => Munich [3] => Beer )
Array ( [0] => 2013 Germany [1] => country [2] => Dusseldorf [3] => Beer )
Array ( [0] => 2013 Italy [1] => country [2] => Venice [3] => Wine )
Array ( [0] => 2013 Russia ....) etc
年の昇順で並べ替えたいので、次のようになります
Array ( [0] => 2012 Italy [1] => country [2] => Rome [3] => Wine )
Array ( [0] => 2013 Germany [1] => country [2] => Berlin [3] => Beer)
Array ( [0] => 2013 Germany [1] => country [2] => Munich [3] => Beer )....
sort、asort、およびnatsortを試しましたが、これまでのところどれも機能していないようです。
何か案は?