带有额外标志的多维数组排序

Question

I'm trying to sort a multidimensional array with an extra flag. The array got childs with name and a optional checked flag. I want to sort this array by checked, and then name. I've got this working fine on the name part, but I can't seem to get the checked flag in it.

<?php

$data = array(
    array(
        'name' => 'C'
    ),
    array(
        'name' => 'A'
    ),
    array(
        'name' => 'E',
        'checked' => true
    ),
    array(
        'name' => 'B',
        'checked' => true
    ),
    array(
        'name' => 'F'
    ),
    array(
        'name' => 'D'
    )
);

usort($data, function($a, $b) {
    return strcmp($a['name'], $b['name']);
});

For the record: I want this as the result: B E A C D F

Any help would be appreciated.

Answer 1

Within usort you can "prioritize" the checked flag:

usort($data, function($a, $b) {

    $diff = strcmp($a['name'], $b['name']);

    if (isset($a['checked']) && isset($b['checked'])) return $diff;
    if (isset($a['checked'])) return -1;
    if (isset($b['checked'])) return 1;
    return $diff;
});

If you ever add in 'checked' => false attributes, you'd have to change the logic accordingly.