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  1. <?php
  2.  
  3. $numbers = [[1,2],[3,4]];
  4.  
  5. // Меняем местами по ключу
  6. foreach ($numbers as $key => $number){
  7.    $numbers[$key] = array_reverse($number);
  8. }
  9.  
  10. print_r($numbers);
  11.  
  12. // Меняем местами по ссылке
  13. foreach ($numbers as &$number){
  14.    $number = array_reverse($number);
  15. }
  16.  
  17. print_r($numbers);
  18.  
Success #stdin #stdout 0.02s 24360KB
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Standard input is empty
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Array
(
    [0] => Array
        (
            [0] => 2
            [1] => 1
        )

    [1] => Array
        (
            [0] => 4
            [1] => 3
        )

)
Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
        )

    [1] => Array
        (
            [0] => 3
            [1] => 4
        )

)
https://ideone.com/xYnZhY
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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