Question 41744 in PHP Question posted in
Official manual can be found here.

How can I set an array use foreach? – PHP

This is my code:

$arr = [
  
    [step_1] => Array
        (
            [method] => getLastRealisesData
            [description] => Get last realises data
            [error] => null
            [done] => 0
        )

    [step_2] => Array
        (
            [method] => downloadFile
            [description] => Download file
            [error] => null
            [done] => 0
        )

];

foreach($arr as $item){
   $result = 0;
   if($result == 0){
      $item['done'] = 0;
      $item['error'] = 'Error message';
      break;
   }

   $result = 1;
}

My value did not update, why?
I need to update my value if I my result == 0
Mayby I need to use object or somethink else…

Tags:

2

Answers


  1. 0

    If you want to amend the array you are processing with the foreach loop, you have to use a reference, otherwise the foreach gets a copy of the array to process and any changes made within the loop to the array will dissapear at the end of the foreach as the copy is discarded.

    
foreach($arr as &$item){
//  note        ^ reference
    $result = 0;
    if($result == 0){
        $item['done'] = 0;
        $item['error'] = 'Error message';
        break;
    }
    $result = 1;
}
unset($item);  // unset the reference
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  2. 0

    From php documentation here:

    In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.

    <?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
unset($value); // break the reference with the last element
?>

    Also you may be interested in what by reference means. Again, docs.

    Note also that reference of a $value and the last array element remain even after the foreach loop. It is recommended to destroy it by unset().

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