How to set the member values inside of a foreach loop

Question

Is there a way to set the value of members of an array with foreach?

<?
  $arr = array(0=>'a',1=>'b',2=>'c',3=>'d');

  foreach($arr as $key => $value){
    $value = 'a';
  }

  var_dump($arr);
?>

returns:

array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

Where what I am trying to get it to return is:

   array(4) {
      [0]=>
      string(1) "a"
      [1]=>
      string(1) "a"
      [2]=>
      string(1) "a"
      [3]=>
      string(1) "a"
    }

Here is a link to the codepad I was using.

http://codepad.org/FQpPYFtz

+1 for providing a complete, minimal and usefully abstracted sample. More people should do it this way. — Tomalak
– Tomalak, Commented Feb 19, 2012 at 11:04

Tomalak · Accepted Answer · 2012-02-19 10:32:10Z

3

$arr = array(0=>'a',1=>'b',2=>'c',3=>'d');

foreach($arr as $key => &$value) {  // <-- use reference to $value
  $value = 'a';
}

var_dump($arr);

answered Feb 19, 2012 at 10:32

Tomalak

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1 Comment

RD Ward Over a year ago

Exactly the quick fix I was searching for. Looks like I am going to have to try harder to understand this reference thing. Thank you for pointing this out to me!

dbrumann · Accepted Answer · 2012-02-19 10:31:09Z

3

It is quite simple:

foreach ($data as $key => $value) {
    $data[$key] = 'new value';
}

answered Feb 19, 2012 at 10:31

dbrumann

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