php asort不适用于文本字符串数组

Question

我有一个数组

print_r($RL_all_years_unique_0);

给出：

Array ( [0] => kWh Electricity [1] => Kg Refrigerants [2] => Gallons Diesel [3] => Indirect VMT [4] => Short Tons Solid Waste [5] => Gallons Propane [6] => Cubic Ft Nat Gas [7] => Gallons 87 Gasoline [8] => WasteWater - kg N [9] => WasteWater - Pop ) 

然后我做：

asort($RL_all_years_unique_0);
print_r($RL_all_years_unique_0);

给出：

Array ( [6] => Cubic Ft Nat Gas [7] => Gallons 87 Gasoline [2] => Gallons Diesel [5] => Gallons Propane [3] => Indirect VMT [1] => Kg Refrigerants [4] => Short Tons Solid Waste [9] => WasteWater - Pop [8] => WasteWater - kg N [0] => kWh Electricity )

为什么 kWh Electricity 是最后，而不是之后"Kg Refrigerants"？除了那个之外，一切都是按字母顺序排列的。

Answer 1

使用natcasesort进行不区分大小写的排序。

natcasesort($RL_all_years_unique_0);
print_r($RL_all_years_unique_0);

或者

sort($fruits, SORT_NATURAL | SORT_FLAG_CASE);

或者

asort($fruits, SORT_NATURAL | SORT_FLAG_CASE);