PHP: references in foreach

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<?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

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