PHP: references in foreach

1
2
3
4
5
6
7
8
9
10
11

<?php
$a = ['a1','a2'];
var_dump($a);
 
foreach ($a as &$val) {}
var_dump($a);
 
$b = ['b3'];
foreach ($b as $val) {}
var_dump($a);
?>

array(2) {
  [0]=>
  string(2) "a1"
  [1]=>
  string(2) "a2"
}
array(2) {
  [0]=>
  string(2) "a1"
  [1]=>
  &string(2) "a2"
}
array(2) {
  [0]=>
  string(2) "a1"
  [1]=>
  &string(2) "b3"
}

unset($val); // break the reference with the last element

Christian Weiske
owner

History

• 530dba 8 years ago
• c6859c 8 years ago
• 19ae6f 8 years ago
• 3efdb8 8 years ago
• 3b058f 8 years ago
• abd471 8 years ago