在PHP中对多维数组值进行排序

Question

I have the following array:

Array ( [0] => Array 
               ( [name] => Jonah 
                 [age] => 27 )
        [1] => Array 
               ( [name] => Bianca 
                 [age] => 32 )
      )

Is it possible to sort the sub-array values in [age] into some sort of order, such as lowest to highest or vice versa?

Answer 1

You can do this using usort :

usort($arr, function($a, $b)
{
    return $a['age'] - $b['age']; // sorts lowest to highest
});

Swap $a and $b in the function to reverse the ordering.

Answer 2

I think this should be possible with bool usort ( array &$array , callback $cmp_function )

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

Just define a callback that sorts by the [age] key of the value.

Answer 3

This will work:

$ages = array();
foreach ($array as $value) {
  $ages[] = $value;
}

array_multisort($values, SORT_ASC, $array);

Any way is good, but this is the "PHP way" :

array_multisort() can be used to sort several arrays at once, or a multi-dimensional array by one or more dimensions .