PHP按几个标准排序数组

Question

I am coding with PHP and having a multidimensional array. I would like to sort my array. The most important criteria is total points. The second criteria is name.

In other words, the array should be sorted that way:

1st by [info][total], descending

2nd by [info][name], ascending

Array (
  [183] => Array (
    [3] => Array (
      [1] => Array ()
    )

    [1] => Array (
      [8] => Array ()
    )

    [info] => Array (
      [name] => Doe John /* 2nd criteria */
      [total] => 4800 /* 1st criteria */
    )
  )

  [380] => Array (
    [4] => Array (
      [6] => Array ()
    )

    [info] => Array (
      [name] => Davis Ben /* 2nd criteria */
      [total] => 14500 /* 1st criteria */
    )

    [2] => Array (
      [5] => Array ()
    )
  )
)

So, the result should be like this:

Array (
  [380] => Array (
    [4] => Array (
      [6] => Array ()
    )

    [info] => Array (
      [name] => Davis Ben
      [total] => 14500
    )

    [2] => Array (
      [5] => Array ()
    )
  )

  [183] => Array (
    [3] => Array (
      [1] => Array ()
    )

    [1] => Array (
      [8] => Array ()
    )

    [info] => Array (
      [name] => Doe John
      [total] => 4800
    )
  )
)

I have tried this:

foreach ($array as &$item)
{
  uasort($item, function ($a, $b)
  {
    if ($a['total'] == $b['total']
    {
      return $b['name'] - $a['name'];
    }
    else
    {
      return $b['total'] - $a['total'];
    }
  }); 
}

I also tried this, but it does not help:

foreach ($array as &$item)
{
  uasort($item, function ($a, $b)
  {
    if ($a['info']['total'] == $b['info']['total'])
    {
      return $b['info']['name'] - $a['info']['name'];
    }
    else
    {
      return $b['info']['total'] - $a['info']['total'];
    }
  });
}

Answer 1

The request of your question (order the values by custom criteria, keep the associations between keys and values) perfectly matches the description of PHP function uasort().

The code is something like this:

$input = Array(
    '183' => Array(
        '3' => Array(
            '1' => Array(),
        ),
        '1' => Array(
            '8' => Array(),
        ),
        'info' => Array(
            'name'  => 'Doe John',      /* 2nd criteria */
            'total' => 4800,            /* 1st criteria */
        ),
    ),
    '380' => Array(
        '4' => Array(
            '6' => Array(),
        ),
        'info' => Array(
            'name'  => 'Davis Ben',     /* 2nd criteria */
            'total' => 14500,           /* 1st criteria */
        ),
        '2' => Array(
            '5' => Array(),
        ),
    ),
);

uasort($input, function (array $a, array $b) {
    // compare using the 1st criterion
    if ($a['info']['total'] != $b['info']['total']) {
        return $b['info']['total'] - $a['info']['total'];       // < 0 when $a > $b (descending)
    }

    // equality on the 1st criterion, use the 2nd one
    return strcmp($a['info']['name'], $b['info']['name']);      // < 0 when $a < $b (ascending)
});