按自定义顺序对php数组列进行排序

Question

I have an array of arrays:

Array ( 
[0] => Array (
    [a] = 1,
    [b] = 'ABC',
    [c] = 'ABC',
[1] => Array (
    [a] = 2,
    [b] = 'DEF',
    [c] = 'DEF',
[2] => Array (
    [a] = 3,
    [b] = 'JKL',
    [c] = 'JKL',

how can i have my array become like this:

Array ( 
[0] => Array (
    [b] = 'ABC',
    [a] = 1,
    [c] = 'ABC',
[1] => Array (
    [b] = 'DEF',
    [a] = 2,
    [c] = 'DEF',
[2] => Array (
    [b] = 'JKL',
    [a] = 3,
    [c] = 'JKL',

can i sort it by string value "b" then "a" then "c" ?

Answer 1

Sure you can, you just need to write your own compare function for it, and combine it with uksort. In your case, you could use a function like this ($inputis your input array, $output the result ldo):

$output = array_map(uksort($input, function ($a, $b) {
  if ($a === 'b') return -1;
  if ($a === 'c') return 1;
  if ($b === 'b') return 1;
  return -1;
}

You might want to rewrite the function, but the combination of array_map and uksort should get you started. Or don't;) since keys are unique, the four if s actually do the trick.