如何根据 PHP 中另一个（部分）数组的值对数组进行排序？

Question

How to sort an array based on the values of another (partial) array in PHP? Ie $toBeSorted is the target array, $sortByThis provides the keys (not all keys!):

// Array to be sorted (mantaining key-values correlations)
$toBeSorted = array(
    'id'       => 'Identifier',
    'username' => 'Username',
    'phone'    => 'Phone number',
    'email'    => 'E-mail',
);

$sortByThis = array('username', 'id');

// Result should be username, id, email, phone
// The remaining portion of array should be sorted with ksort()

I remember (but I'm not 100% sure) a function to quickly do this. Actually I've used:

// Sort the first portion of the array
$sorted = array_intersect_key($toBeSorted, array_flip($sortByThis));

// Sort the remaining portion
$remain = array_diff_key($toBeSorted, $sorted);
ksort($remain);

$toBeSorted = array_merge($sorted, $remain);

Answer 1

You could use uksort to put together.

uksort($toBeSorted, function($a, $b) use ($sortByThis) {
    $key_a = array_search($a, $sortByThis);
    $key_b = array_search($b, $sortByThis);
    if ($key_a === false && $key_b === false) {
        return strcmp($a, $b);
    } else if ($key_a === false) {
        return 1;
    } else if ($key_b === false) {
        return -1;
    } else {
        return $key_a - $key_b;
    }
});

THE DEMO.

Answer 2

Simply using array_merge seems to work:

ksort($toBeSorted);
print_r(array_merge(array_flip($sortByThis), $toBeSorted));

Outputs:

Array
(
    [username] => Username
    [id] => Identifier
    [email] => E-mail
    [phone] => Phone number
)

Link to codepad

Answer 3

have a look on array_multisort() function. http://php.net/manual/en/function.array-multisort.php

You can achieve this by doing something like this.

$sorted_arr= array_multisort($toBeSorted, array('username'=>SORT_ASC, 'id'=>SORT_ASC));

If this not help you there are other functions submitted by users.