Recursively iterate over an array to change specific key's value

Question

I have an array like this:

$a = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => array(
        'key4' => 'value4',
        'key5' => array(
            'key6' => 'value6'
        )
    )
);

as you can see there are inner arrays inside $a

Now, I have a list of keys, example:

key1
key4
key6

I need a script that search if those key exists, and if exists change their values. I Need to change their values with base64_encode($value_of_the_key)

so Maybe a callback that get the current value and convert it using base64_encode() function.

COuld someone help me?

I'm tring to see the current php functions but it seems there is not ones that do this thing.

THanks

EDIT:

Using the follow code i can get the keys in the callback....but the problem is:

How can i modify the values directly in the array? I Mean.... ok ... i get key and value, but how to change the value in the original array? ($a)

$a = array(
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => array(
        'key4' => 'value4',
        'key5' => array(
            'key6' => 'value6'
        )
    )
);


function test($item, $key)
{
    echo "$key. $item<br />\n";
}


array_walk_recursive($a, 'test');

tijs · Accepted Answer · 2012-08-10 10:44:11Z

5

array_walk_recursive() with callback supplied should help. More info here.

answered Aug 10, 2012 at 10:44

tijs

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2 Comments

Dail Over a year ago

thank you for the reply, but please take a look at the edit i made in the question. Thanks

Yoshi Over a year ago

@Dail use function test(&$item, $key) (note the &) and modify $item inside the function.

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