根据数组中给定的键提取数组部分

Question

I have two arrays. One containing the data and other contains the keys. So I have

$data = array(
    'name' => array('label' => 'Name:', 'value' => 'Genghis'),
    'age' => array('label' => 'Age:', 'value' => '67'),
    'weigh' => array('label' => 'Weigh in Kgs:', 'value' => '78')
);

and

$keys = array('name', 'age');

Now I want to extract only the name and age elements of $data. Some thing like this.

$extracted = somemethod($data, $keys);
var_export($extracted);

Output should be like this.

array(
    'name' => array(
        'label' => 'Name:', 
        'value' => 'Genghis',
    ),
    'age' => array(
        'label' => 'Age:',
        'value' => '67',
    ),
)

How can i do this?

Answer 1

I would use an array_intersect_key() function like this:

$data = array(...); // initial array as described
$retained_keys = array('name' => 'value not used', 'age' => 'value not used');

$filtered_array = array_intersect_key($data, $retained_keys);