如何按自定义顺序对数组进行排序

Question

I have an array, and I would like to out put value on specific order. How I can do this.

Array

$age = array(48,37,43,56,32);

Output I want

37
56
43
32
48

I have put array $age in foreach loop. I created another array outside foreach loop. I am doing array Push if the the value = xx. Its not working.

What is the best way so I can have my result coming out in above order.

Answer 1

I'm not sure, I understand your question correctly but if you already know the order than what's the purpose of making this array.

Well, I guess I have two solutions to sort this array in your custom order

Option 1

Specify $order array (if it's already known to you) and use usort to compare the values of $age and $order arrays. usort will find the items of $age within the $order array.

$order = array(37, 56, 43, 32, 48);
$age = array(48, 37, 43, 56, 32);

usort($age, function ($a, $b) use ($order) {
    $firstItem  = array_search($a, $order);
    $secondItem = array_search($b, $order);

    return $firstItem - $secondItem;
});

print_r($age);

I've used closure in usort to make sorting simpler

Output

Array
(
    [0] => 37
    [1] => 56
    [2] => 43
    [3] => 32
    [4] => 48
)

You can check usort and array_search

Option 2

From your comment, I tried to come up with another approach which is setting the keys in $age and $order arrays and compare both arrays to sort it in custom order.

$order = array('students', 'adults', 'disable', 'enable', "variable");
$age = array(
    'variable' => 48,
    'students' => 37,
    'disable' => 43,
    'adults' => 56,
    'enable' => 32
);

$ordered_array = array_merge(array_flip($order), $age);
print_r($ordered_array);

Output

Array
(
    [students] => 37
    [adults] => 56
    [disable] => 43
    [enable] => 32
    [variable] => 48
)

Also check array_merge and array_flip