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@ 2021-06-12T15:32:03Z

<?php

function getComments(int $parentId = null): array {
    $comments = [
        ['id' => 1, 'parentId' => null, 'comment' => 'foo'],
        ['id' => 2, 'parentId' => null, 'comment' => 'bar'],
        ['id' => 3, 'parentId' => 1, 'comment' => 'foo 1'],
        ['id' => 4, 'parentId' => 1, 'comment' => 'foo 2'],
        ['id' => 5, 'parentId' => 4, 'comment' => 'foo 2-1'],
        ['id' => 6, 'parentId' => 2, 'comment' => 'foo bar'],
        ['id' => 7, 'parentId' => 5, 'comment' => 'foo 2-1-1'],
    ];
    
    return array_filter($comments, fn (array $comment): bool => $comment['parentId'] === $parentId);
}

function showComments(?int $parentId = null, int $level =  0) {
    foreach (getComments($parentId) as $comment) {
        printf('%sComment id: %d - comment %s', str_repeat('   ', $level), $comment['id'], $comment['comment']);
        echo "\n";

        showComments($comment['id'], $level + 1);
    }
}

showComments();

Output for git.master, git.master_jit, rfc.property-hooks: Comment id: 1 - comment foo Comment id: 3 - comment foo 1 Comment id: 4 - comment foo 2 Comment id: 5 - comment foo 2-1 Comment id: 7 - comment foo 2-1-1 Comment id: 2 - comment bar Comment id: 6 - comment foo bar

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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