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  1. <?php
  2.  
  3. $data = array(
  4.     array('zz', 'name' => 'Jack', 'number' => 22, 'birthday' => '12/03/1980'),
  5.     array('xx', 'name' => 'Adam', 'number' => 16, 'birthday' => '01/12/1979'),
  6.     array('aa', 'name' => 'Paul', 'number' => 16, 'birthday' => '03/11/1987'),
  7.     array('cc', 'name' => 'Helen', 'number' => 44, 'birthday' => '24/06/1967'),
  8. );
  9.  
  10. usort($data, make_comparer('birthday'));
  11. print_r($data);
  12.  
  13.  
  14. function make_comparer() {
  15.     // Normalize criteria up front so that the comparer finds everything tidy
  16.     $criteria = func_get_args();
  17.     foreach ($criteria as $index => $criterion) {
  18.         $criteria[$index] = is_array($criterion)
  19.             ? array_pad($criterion, 3, null)
  20.             : array($criterion, SORT_ASC, null);
  21.     }
  22.  
  23.     return function($first, $second) use ($criteria) {
  24.         foreach ($criteria as $criterion) {
  25.             // How will we compare this round?
  26.             list($column, $sortOrder, $projection) = $criterion;
  27.             $sortOrder = $sortOrder === SORT_DESC ? -1 : 1;
  28.  
  29.             // If a projection was defined project the values now
  30.             if ($projection) {
  31.                 $lhs = call_user_func($projection, $first[$column]);
  32.                 $rhs = call_user_func($projection, $second[$column]);
  33.             }
  34.             else {
  35.                 $lhs = $first[$column];
  36.                 $rhs = $second[$column];
  37.             }
  38.  
  39.             // Do the actual comparison; do not return if equal
  40.             if ($lhs < $rhs) {
  41.                 return -1 * $sortOrder;
  42.             }
  43.             else if ($lhs > $rhs) {
  44.                 return 1 * $sortOrder;
  45.             }
  46.         }
  47.  
  48.         return 0; // tiebreakers exhausted, so $first == $second
  49.     };
  50. }
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => Array
        (
            [0] => xx
            [name] => Adam
            [number] => 16
            [birthday] => 01/12/1979
        )

    [1] => Array
        (
            [0] => aa
            [name] => Paul
            [number] => 16
            [birthday] => 03/11/1987
        )

    [2] => Array
        (
            [0] => zz
            [name] => Jack
            [number] => 22
            [birthday] => 12/03/1980
        )

    [3] => Array
        (
            [0] => cc
            [name] => Helen
            [number] => 44
            [birthday] => 24/06/1967
        )

)
https://ideone.com/GvXmoM
Example #6: sorting birthdays without projection (bad)
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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