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@ 2020-10-21T22:23:32Z

<?php

$indexes = [
    26 => ["namespace" => "X\\Y\\Zed"],
    9 =>  ["namespace" => "A\\B\\See"],
    3 =>  ["namespace" => "A\\B\\Bee"],
    38 => ["namespace" => "A\\B\\C\\Dee"],
    51 => ["namespace" => "X\\Wye"],
    16 => ["namespace" => "A\\Sea"],
    12 => ["namespace" => "A\\Bees"],
];

uasort($indexes, static function (array $entry1, array $entry2): int {  
    $ns1Parts = explode('\\', $entry1['namespace']);
    $ns2Parts = explode('\\', $entry2['namespace']);

    $ns1Length = count($ns1Parts);
    $ns2Length = count($ns2Parts);

    for ($i = 0; $i < $ns1Length && isset($ns2Parts[$i]); $i++) {
        $isLastPartForNs1 = $i === $ns1Length - 1;
        $isLastPartForNs2 = $i === $ns2Length - 1;

        if ($isLastPartForNs1 !== $isLastPartForNs2) {
            return $isLastPartForNs1 <=> $isLastPartForNs2;
        }

        $nsComparison = $ns1Parts[$i] <=> $ns2Parts[$i];
        
        if ($nsComparison !== 0) {
            return $nsComparison;
        }
    }

    return 0;
});

print_r($indexes);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [38] => Array ( [namespace] => A\B\C\Dee ) [3] => Array ( [namespace] => A\B\Bee ) [9] => Array ( [namespace] => A\B\See ) [12] => Array ( [namespace] => A\Bees ) [16] => Array ( [namespace] => A\Sea ) [26] => Array ( [namespace] => X\Y\Zed ) [51] => Array ( [namespace] => X\Wye ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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