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@ 2014-04-03T07:10:16Z

<?php

function createMultiKeyCmpFunc($cmp, $key /* , keys... */) {
    $keys = func_get_args();
    array_shift($keys);

    return function (array $a, array $b) use ($cmp, $keys) {
        return array_reduce($keys, function ($result, $key) use ($cmp, $a, $b) {
            return $result ?: call_user_func($cmp, $a[$key], $b[$key]);
        });
    };
}

$array = [
    ['foo' => 4, 'bar' => 2, 'baz' => 3],
    ['foo' => 4, 'bar' => 3, 'baz' => 3],
    ['foo' => 3, 'bar' => 2, 'baz' => 3],
    ['foo' => 4, 'bar' => 1, 'baz' => 6],
    ['foo' => 3, 'bar' => 2, 'baz' => 3],
    ['foo' => 1, 'bar' => 4, 'baz' => 3],
    ['foo' => 2, 'bar' => 2, 'baz' => 1],
    ['foo' => 6, 'bar' => 6, 'baz' => 8],
    ['foo' => 6, 'bar' => 2, 'baz' => 3],
    ['foo' => 3, 'bar' => 1, 'baz' => 5],
    ['foo' => 4, 'bar' => 2, 'baz' => 3],
];

usort($array, createMultiKeyCmpFunc('strcmp', 'foo', 'bar', 'baz'));

var_dump($array);

Output for git.master, git.master_jit, rfc.property-hooks: array(11) { [0]=> array(3) { ["foo"]=> int(1) ["bar"]=> int(4) ["baz"]=> int(3) } [1]=> array(3) { ["foo"]=> int(2) ["bar"]=> int(2) ["baz"]=> int(1) } [2]=> array(3) { ["foo"]=> int(3) ["bar"]=> int(1) ["baz"]=> int(5) } [3]=> array(3) { ["foo"]=> int(3) ["bar"]=> int(2) ["baz"]=> int(3) } [4]=> array(3) { ["foo"]=> int(3) ["bar"]=> int(2) ["baz"]=> int(3) } [5]=> array(3) { ["foo"]=> int(4) ["bar"]=> int(1) ["baz"]=> int(6) } [6]=> array(3) { ["foo"]=> int(4) ["bar"]=> int(2) ["baz"]=> int(3) } [7]=> array(3) { ["foo"]=> int(4) ["bar"]=> int(2) ["baz"]=> int(3) } [8]=> array(3) { ["foo"]=> int(4) ["bar"]=> int(3) ["baz"]=> int(3) } [9]=> array(3) { ["foo"]=> int(6) ["bar"]=> int(2) ["baz"]=> int(3) } [10]=> array(3) { ["foo"]=> int(6) ["bar"]=> int(6) ["baz"]=> int(8) } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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