How would I sort an Array of Std Class Objects by specific listing order?

Question

I have an array of StdClass Objects and that contains several different Car Types (ex. Compact Car, Minivan, etc.) which is sorted by price. I would like to sort the array in the following order:

• Economy Car
• Compact Car
• Mid-Size Car
• Standard-Size Car
• Full-Size Car
• Premium Car
• Luxury Car
• Standard-Size Convertible
• Mid-Size SUV
• Standard SUV
• Full-Size SUV
• Minivan
• Remaining cars sorted by price

I'm not sure if it makes sense to sort this order using key "description" or "codes". I've figured out how to sort by price, but not sure how to reorder the array in the above order listed. Any help would be appreciated. Thanks!

Input Array:

    array (
    0 => 
    stdClass::__set_state(array(
       'description' => 'Mid-Size SUV',
       'codes' => 
      array (
        0 => 'IFAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '30.31',
    )),
    1 => 
    stdClass::__set_state(array(
       'description' => 'Standard-Size SUV',
       'codes' => 
      array (
        0 => 'SFAR',
        1 => 'RFAR',
      ),
       'max_people' => '7',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '35.53',
    )),
    2 => 
    stdClass::__set_state(array(
       'description' => 'Specialty Vehicle',
       'codes' => 
      array (
        0 => 'XXAR',
      ),
       'max_people' => false,
       'min_people' => false,
       'max_bags' => '',
       'min_bags' => '',
       'price' => '36.72',
    )),
    3 => 
    stdClass::__set_state(array(
       'description' => 'Compact Car',
       'codes' => 
      array (
        0 => 'CCAR',
        1 => 'CDAR',
      ),
       'max_people' => '5',
       'min_people' => '4',
       'max_bags' => '3',
       'min_bags' => '1',
       'price' => '37.21',
    )),
    4 => 
    stdClass::__set_state(array(
       'description' => 'Economy Car',
       'codes' => 
      array (
        0 => 'ECAR',
        1 => 'EDAR',
      ),
       'max_people' => '5',
       'min_people' => '4',
       'max_bags' => '2',
       'min_bags' => '1',
       'price' => '37.21',
    )),
    5 => 
    stdClass::__set_state(array(
       'description' => 'Mid-Size Car',
       'codes' => 
      array (
        0 => 'ICAR',
        1 => 'IDAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '39.46',
    )),
    6 => 
    stdClass::__set_state(array(
       'description' => 'Standard-Size Car',
       'codes' => 
      array (
        0 => 'SCAR',
        1 => 'SDAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '41.77',
    )),
    7 => 
    stdClass::__set_state(array(
       'description' => 'Minivan',
       'codes' => 
      array (
        0 => 'MVAR',
      ),
       'max_people' => '7',
       'min_people' => '7',
       'max_bags' => '5',
       'min_bags' => '2',
       'price' => '43.18',
    )),
    8 => 
    stdClass::__set_state(array(
       'description' => 'Full-Size Car',
       'codes' => 
      array (
        0 => 'FCAR',
        1 => 'FDAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '43.50',
    )),
    9 => 
    stdClass::__set_state(array(
       'description' => 'Compact SUV',
       'codes' => 
      array (
        0 => 'CFAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '3',
       'min_bags' => '3',
       'price' => '46.42',
    )),
    10 => 
    stdClass::__set_state(array(
       'description' => 'Full-Size Hybrid',
       'codes' => 
      array (
        0 => 'FCAH',
      ),
       'max_people' => false,
       'min_people' => false,
       'max_bags' => '',
       'min_bags' => '',
       'price' => '48.00',
    )),
    11 => 
    stdClass::__set_state(array(
       'description' => 'Standard-Size Convertible',
       'codes' => 
      array (
        0 => 'STAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '4',
       'min_bags' => '1',
       'price' => '48.39',
    )),
    12 => 
    stdClass::__set_state(array(
       'description' => 'Sports Car',
       'codes' => 
      array (
        0 => 'XSAR',
        1 => 'SSAR',
      ),
       'max_people' => '5',
       'min_people' => '4',
       'max_bags' => '3',
       'min_bags' => '1',
       'price' => '48.72',
    )),
    13 => 
    stdClass::__set_state(array(
       'description' => 'Premium Car',
       'codes' => 
      array (
        0 => 'PCAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '4',
       'min_bags' => '2',
       'price' => '48.72',
    )),
    14 => 
    stdClass::__set_state(array(
       'description' => 'Luxury Car',
       'codes' => 
      array (
        0 => 'LCAR',
        1 => 'LDAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '5',
       'min_bags' => '1',
       'price' => '52.16',
    )),
    15 => 
    stdClass::__set_state(array(
       'description' => 'Full-Size SUV',
       'codes' => 
      array (
        0 => 'FFAR',
      ),
       'max_people' => '8',
       'min_people' => '7',
       'max_bags' => '4',
       'min_bags' => '2',
       'price' => '52.92',
    )),
    16 => 
    stdClass::__set_state(array(
       'description' => 'Full-Size Van',
       'codes' => 
      array (
        0 => 'FVAR',
      ),
       'max_people' => '15',
       'min_people' => '12',
       'max_bags' => '5',
       'min_bags' => '1',
       'price' => '90.38',
    )),
    17 => 
    stdClass::__set_state(array(
       'description' => 'Compact Convertible',
       'codes' => 
      array (
        0 => 'CTAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '1',
       'min_bags' => '1',
       'price' => '91.17',
    )),
    18 => 
    stdClass::__set_state(array(
       'description' => 'Premium SUV',
       'codes' => 
      array (
        0 => 'PFAR',
        1 => 'UFAR',
      ),
       'max_people' => '7',
       'min_people' => '5',
       'max_bags' => '5',
       'min_bags' => '1',
       'price' => '92.64',
    )),
    19 => 
    stdClass::__set_state(array(
       'description' => 'Specialty Car',
       'codes' => 
      array (
        0 => 'XCAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '3',
       'min_bags' => '3',
       'price' => '94.42',
    )),
    20 => 
    stdClass::__set_state(array(
       'description' => 'Mid-Size Convertible',
       'codes' => 
      array (
        0 => 'ITAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '2',
       'min_bags' => '2',
       'price' => '97.98',
    )),
    21 => 
    stdClass::__set_state(array(
       'description' => 'Luxury SUV',
       'codes' => 
      array (
        0 => 'LFAR',
      ),
       'max_people' => '5',
       'min_people' => '5',
       'max_bags' => '3',
       'min_bags' => '3',
       'price' => '113.66',
    )),
    22 => 
    stdClass::__set_state(array(
       'description' => 'Premium Convertible',
       'codes' => 
      array (
        0 => 'PTAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '1',
       'min_bags' => '1',
       'price' => '121.15',
    )),
    23 => 
    stdClass::__set_state(array(
       'description' => 'Luxury Convertible',
       'codes' => 
      array (
        0 => 'LTAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '1',
       'min_bags' => '1',
       'price' => '129.01',
    )),
    24 => 
    stdClass::__set_state(array(
       'description' => 'Premium Van',
       'codes' => 
      array (
        0 => 'PVAR',
      ),
       'max_people' => '15',
       'min_people' => '15',
       'max_bags' => '1',
       'min_bags' => '1',
       'price' => '159.49',
    )),
    25 => 
    stdClass::__set_state(array(
       'description' => 'Specialty Convertible',
       'codes' => 
      array (
        0 => 'XTAR',
      ),
       'max_people' => '4',
       'min_people' => '4',
       'max_bags' => '2',
       'min_bags' => '2',
       'price' => '307.64',
    )),
  )

Code:

usort($car_types,function($a,$b) {
    return $a->price == $b->price ? 0 : $a->price > $b->price;
});

usort($car_types, function($a, $b) use ($order) {
    $a_set = intval(isset($order[$a->description]));
    $b_set = intval(isset($order[$b->description]));

    return $a_set === $b_set && $a_set === 1
    ? $order[$a->description] - $order[$b->description]
    : $b_set - $a_set;
});

Answer 1

Define ordering array and use it inside usort:

$order = [
    'Economy Car' => 1,
    'Compact Car' => 2,
    'Mid-Size Car' => 3,
    'Standard-Size Car' => 4,
    'Full-Size Car' => 5,
    'Premium Car' => 6,
    'Luxury Car' => 7,
    'Standard-Size Convertible' => 8,
    'Mid-Size SUV' => 9,
    'Standard SUV' => 10,
    'Full-Size SUV' => 11,
    'Minivan' => 12
];

usort($car_types, function ($a, $b) use ($order) {
    static $notSetPriority;

    $aPriority = isset($order[$a->description])
        ? $order[$a->description]
        : $notSetPriority ?? ($notSetPriority = count($order) + 1);
    $bPriority = isset($order[$b->description])
        ? $order[$b->description]
        : $notSetPriority;

    if (($comparison = $aPriority - $bPriority ) === 0) {
        return floatval($a->price) - floatval($b->price);
    }

    return $comparison;
});

If the order weight for the description is not set, then we give it a weight of most weight plus one.

Do not apply usort more than once, because it is hard to predict the result that way. I have combined both sorting criteria into one.