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  1. <?php
  2.  
  3. $arr = array(1, 2, 3, 4);
  4. foreach ($arr as &$value) {
  5.     $value = $value * 2;
  6. }
  7. var_dump($arr); // array(2, 4, 6, 8)
  8. unset($value); // break the reference with the last element
  9.  
  10.  
  11. $arr = array(1, 2, 3, 4);
  12. array_walk($arr, function (&$value) {
  13. 	$value = $value * 2;
  14. });
  15. var_dump($arr); // array(2, 4, 6, 8)
  16. // no reference with last element is present
Success #stdin #stdout 0.01s 82880KB
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array(4) {
  [0]=>
  int(2)
  [1]=>
  int(4)
  [2]=>
  int(6)
  [3]=>
  &int(8)
}
array(4) {
  [0]=>
  int(2)
  [1]=>
  int(4)
  [2]=>
  int(6)
  [3]=>
  int(8)
}
https://ideone.com/DrW9IE
PHP Example of using `array_walk()` instead of `foreach`.
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
secret

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