按字母顺序按值排序数组 php

Question

As the title suggests i want to sort an array by value alphabetically in php.

$arr = array(
    'k' => 'pig',
    'e' => 'dog'
)

would become

$arr = array(
    'e' => 'dog',
    'k' => 'pig'
)

Any ideas?

EDIT: Here's the actual array i want to sort.

Array ( [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 )

Answer 1

You want the php function "asort":

http://php.net/manual/en/function.asort.php

it sorts the array, maintaining the index associations.

Edit: I've just noticed you're using a standard array (non-associative). if you're not fussed about preserving index associations, use sort():

http://php.net/manual/en/function.sort.php

Answer 2

Note that sort() operates on the array in place , so you only need to call

sort($a);
doSomething($a);

This will not work;

$a = sort($a);
doSomething($a);

Answer 3

• If you just want to sort the array values and don't care for the keys, use sort() . This will give a new array with numeric keys starting from 0 .
• If you want to keep the key-value associations, use asort() .

See also the comparison table of sorting functions in PHP .

Answer 4

asort() - Maintains key association: yes .

sort() - Maintains key association: no .

Source: http://php.net/manual/en/array.sorting.php

Answer 5

Using sort() function, I have:

$array = [
    "Tannois",
    "Bar-le-Duc",
    "Val-d'Ornain",
    "Fains-Véel",
    "Érize-Saint-Dizier",
    "Ville-sur-Saulx",
    "Seigneulles",
    "Behonne"
];
sort($array);

Result is:

[
    "Bar-le-Duc",
    "Behonne",
    "Fains-Véel",
    "Seigneulles",
    "Tannois",
    "Val-d'Ornain",
    "Ville-sur-Saulx",
    "Érize-Saint-Dizier"
]

Érize-Saint-Dizier is the last.

How I can sort it like:

[
    "Bar-le-Duc",
    "Behonne",
    "Érize-Saint-Dizier",
    "Fains-Véel",
    "Seigneulles",
    "Tannois",
    "Val-d'Ornain",
    "Ville-sur-Saulx"
]