When using a foreach loop and a reference, how can I stop the last member pointing to a reference?

Consider this code...

$a = range(1, 5);

foreach($a as &$b) { }

var_dump(开发者_运维问答$a);

The output is...

array(5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  &int(5)
}

CodePad.

See the & on the last member? How can I stop that?

You can unset($b).

$a = range(1, 5);

foreach($a as &$b) { }

unset($b);

var_dump($a);

CodePad.

You should unset() to avoid this...

$a = range(1, 5);

foreach($a as &$b) { }

$b = 10;

var_dump($a);

...which outputs...

array(5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  &int(10)
}

CodePad.