Get unique value of one attribute from array of associative arrays

Question

I have an array like this:

$a = array(
    0 => array(\'type\' => \'bar\', \'image\' => \'a.jpg\'),
    1 => array(\'type\' => \'food\', \'ima         


        

Answer 1

In PHP >= 5.3 with the use of anonymous functions:

$unique_types = array_unique(array_map(function($elem){return $elem['type'];}, $a));

For previous versions you can declare a separate function:

function get_type($elem)
{
    return $elem['type'];
}

$unique_types = array_unique(array_map("get_type", $a));