Отсортировать плоский ассоциативный массив по алфавиту по значениям и сохранить исходные ключи. ⇐ Php

[Anonymous]

Я хочу отсортировать плоский ассоциативный массив по его значениям в алфавитном порядке и сохранить исходные ключи.
$arr = [
0 => 'Newtown',
1 => 'Montgomery',
2 => 'Welshpool',
6 => 'Llanfyllin',
7 => 'Llansanffraid',
8 => 'Llanymynech',
9 => 'Oswestry',
14 => 'Oswestry Town Service',
];

станет
[
6 => 'Llanfyllin',
7 => 'Llansanffraid',
8 => 'Llanymynech',
1 => 'Montgomery',
0 => 'Newtown',
9 => 'Oswestry',
14 => 'Oswestry Town Service',
2 => 'Welshpool',
]

Есть идеи?
Вот мой полный фактический массив для сортировки:
$arr = [
0 => 'Newtown',
1 => 'Montgomery',
2 => 'Welshpool',
6 => 'Llanfyllin',
7 => 'Llansanffraid',
8 => 'Llanymynech',
9 => 'Oswestry',
14 => 'Oswestry Town Service',
15 => 'Aston Way',
16 => 'College Road',
17 => 'Shrewsbury',
18 => 'Royal Shrewsbury Hospital',
19 => 'Worthen',
20 => 'Brockton',
22 => 'Cefn Blodwell',
23 => 'Treflach',
24 => 'Trefonen',
25 => 'Morda',
26 => 'Marches School',
28 => 'North Shropshire College',
37 => 'Park Hall',
38 => 'Gobowen',
39 => 'St Martins',
40 => 'Ifton Heath',
42 => 'Guilsfield',
43 => 'Four Crosses',
45 => 'Pant',
46 => 'Llynclys',
49 => 'Oswestry Town Service Schools',
51 => 'Woodside School',
56 => 'Whittington',
57 => 'Babbinswood',
58 => 'Hindford',
59 => 'Ellesmere',
62 => 'Forden',
63 => 'Kingswood Cock Hotel',
65 => 'Coleg Powys',
85 => 'Borfa Green',
86 => 'Bryn Siriol',
87 => 'Maesydre School',
92 => 'Crew Green',
93 => 'Ford',
104 => 'Llanrhaeadr',
106 => 'Meifod',
114 => 'Llangynog',
116 => 'Llangedwyn',
119 => 'Porthywaen',
132 => 'Llanfair Caereinion',
133 => 'Pontrobet',
136 => 'Dolanog',
141 => 'Llansilin',
144 => 'Abermule',
145 => 'Llandyssil',
146 => 'Carhowel',
149 => 'Cefn Coch',
150 => 'Tregynon',
151 => 'Manafon',
152 => 'Berriew',
157 => 'Bettws Cedewain',
158 => 'Newtown High School',
160 => 'Newtown Coleg Powys',
173 => 'Llanerfyl',
174 => 'Machynlleth',
175 => 'Talybont',
176 => 'Aberystwyth',
183 => 'Bala',
184 => 'Llanrwst',
185 => 'Llandudno',
188 => 'Middletown',
196 => 'Llanidloes',
202 => 'Wrexham',
203 => 'Rhayader',
];



Подробнее здесь: https://stackoverflow.com/questions/167 ... e-original