Change inner value of recursive array

Question

I would like to change the value of a recursive array.

One array provides the path to the variable to change:

$scopePath represents the path to change.

For example if $scopePath==Array("owners","products","categories")

and $tag="price";

I would like to change $value["owners"]["products"]["categories"]["tag"] to true

    $u=$value;
    foreach ($scopePath as $i => $s) {
        if (!isset($u[$s]))
            $u[$s]=Array();
        $u=$u[$s];
    }
    $u[$tag]=true;

I know the problem is because of the line $u=$u[$s] because this changes the reference to $u, but I don't know how to fix it.

Your code actually looks fine. What isn't working as intended? — Niels Keurentjes
– Niels Keurentjes, Commented Jun 11, 2013 at 10:17
line $u=$u[$s]; makes that the value will change the reference of $u. The $value variable doesn't change. — edi9999
– edi9999, Commented Jun 11, 2013 at 10:19

netiul · Accepted Answer · 2013-06-11 10:26:00Z

1

Make $u referencing $value or an element inside $value.

$u = &$value;
foreach($scopePath as $i => $s) {
    if (!isset($u[$s]))
        $u[$s]=Array();
    $u = &$u[$s];
}
$u["tag"] = true;

When $scopePath = array("owners","products","categories")

print_r($value);

will output

Array
(
    [owners] => Array
        (
            [products] => Array
                (
                    [categories] => Array
                        (
                            [tag] => 1
                        )
                )
        )
)

edited Jun 11, 2013 at 10:26

answered Jun 11, 2013 at 10:20

netiul

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Comments

Michael Sivolobov · Accepted Answer · 2013-06-11 10:20:19Z

1

To change your $value variable you must use & in first line:

$u = &$value;

answered Jun 11, 2013 at 10:20

Michael Sivolobov

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