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@ 2022-09-23T00:54:22Z

<?php

$array1 = array(
    'cover.xhtml',
    'title.xhtml',
    'copyright.xhtml',
    'dedication.xhtml',
    'toc_brief.xhtml',
    'toc.xhtml',
    'ch02_1.xhtml',
    'ch02_2.xhtml',
    'ch02_3.xhtml',
    'ch02_4.xhtml',
    'ch02_5.xhtml',
    'ch02_6.xhtml',
    'ch02_7.xhtml',
    'ch02_8.xhtml',
    'ch02_9.xhtml',
    'ch02_10.xhtml'
);

$array2 = array(
    '',
    'title.xhtml',
    'copyright.xhtml',
    'dedication.xhtml',
    'ch02_2.xhtml',
    'ch02_2#454.xhtml',
    'ch02_4.xhtml',
    'ch02_1.xhtml',
    'ch02_11.xhtml',
    'ch02_12.xhtml',
    ''
);
$customOrder = array_flip([
    'cover',
    'title',
    'copyright',
    'dedication',
    'toc_brief',
    'toc',
    'ch'
]);

$uniqueFiltered = array_unique(array_filter(array_merge($array1, $array2)));
usort(
    $uniqueFiltered,
    fn($a, $b) => 
        $customOrder[strtok($a, '.012345789')] <=> $customOrder[strtok($b, '.012345789')]
        ?: strnatcmp(...str_replace('#', '_', [$a, $b]))
);
var_export($uniqueFiltered);

Output for git.master_jit, git.master, rfc.property-hooks: array ( 0 => 'cover.xhtml', 1 => 'title.xhtml', 2 => 'copyright.xhtml', 3 => 'dedication.xhtml', 4 => 'toc_brief.xhtml', 5 => 'toc.xhtml', 6 => 'ch02_1.xhtml', 7 => 'ch02_2.xhtml', 8 => 'ch02_2#454.xhtml', 9 => 'ch02_3.xhtml', 10 => 'ch02_4.xhtml', 11 => 'ch02_5.xhtml', 12 => 'ch02_6.xhtml', 13 => 'ch02_7.xhtml', 14 => 'ch02_8.xhtml', 15 => 'ch02_9.xhtml', 16 => 'ch02_10.xhtml', 17 => 'ch02_11.xhtml', 18 => 'ch02_12.xhtml', )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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