gistfile1.php

<?php

// Adapted from http://stackoverflow.com/a/1320259
function array_flatten($array)
{
    return iterator_to_array(
        new RecursiveIteratorIterator(
            new RecursiveArrayIterator($array)
        ),
        false
    );
}

// > flat(array(12, 3.45, 'ab', true, array('cd', 67, array(false))));
// → array(12, 3.4500000000000002, 'ab', true, 'cd', 67, false)

// > flat(array(12, 3.45, 'ab', true, array('cd', 67), null, 8, array(), 9));
// → array(12, 3.4500000000000002, 'ab', true, 'cd', 67, NULL, 8, 9)