Find array key in php and change its value or contents?

Question

Given a multi-dimensional array that you don't necessarily know the structure of; how would one search for a key by name and change or add to it's contents? The value of the key could be either a string or an array and the effects should be applied either way--I had looked at array_walk_recursive, but it ignores anything that contains another array...

Answer 1

Array keys in PHP are ints and strings. You can't have an array array key. So yeah, array_walk_recursive() is what you want.

Answer 2

From Arrays:

A key may be either an integer or a string.

Arrays cannot be used as keys.

To get the keys of an array, use array_keys.

Answer 3

Does this work?

function arrayWalkFullRecursive(&$array, $callback, $userdata = NULL) {
    call_user_func($callback, $value, $key, $userdata);

    if(!is_array($array)) {
        return false;
    }

    foreach($array as $key => &$value) {
        arrayWalkFullRecursive($value);
    }

    return true;
}

arrayWalkFullRecursive($array,
    create_function(                // wtb PHP 5.3
        '&$value, $key, $data',
        'if($key == $data['key']) {
             $value = $data['value'];
         }'
    ),
    array('key' => 'foo', 'value' => 'bar')
);