Code Inspection: Write access to referenced array value without 'unset'

Reports the write access expressions on variables that are still referencing the array value previously used in a foreach statement.

It is recommended to destroy such references by using unset.

See foreach (php.net) and unset (php.net) for details.

In the following example, $item still references the last element of the array after the foreach loop. As a result, assigning $item with a value will unintentionally modify the array. After the quick-fix is applied, the unset($item) call that destroys the reference is added before value assignment.

$arr = [1, 2, 3];

foreach ($arr as &$item) {
    $item *= 2;
}

$item = 3;

$arr = [1, 2, 3];

foreach ($arr as &$item) {
    $item *= 2;
}

unset($item);
$item = 3;

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Last modified: 16 May 2022