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@ 2020-09-14T07:40:34Z

<?php
$array = [
    "# Grandparent #1",
    "# Grandparent #2",
    "## Parent #2-1",
    "### Child #2-1-1",
    "## Parent #2-2",
    "### Child #2-2-1",
    "### Child #2-2-2",
    "## Parent #2-3",
    "## Parent #2-4",
    "# Grandparent #3",
    "## Parent #3-1",
];

function recurse(array $lines, int $level = 1): array
{
    $tree = [];
    $directDescendants = [];
    foreach($lines as $line) {
        [$hashes, $name] = explode(' ', $line, 2);
        $depth = strlen($hashes);
        if ($depth === $level) {
            if ($directDescendants) {
                $parent['children'] = recurse($directDescendants, $level + 1);
            }
            $directDescendants = [];      // reset collection of direct descendants
            unset($parent);               // destroy reference
            $parent = ['name' => $name];  // name the member
            $tree[] = &$parent;           // push the reference variable into the tree
        } elseif ($depth > $level) {
            $directDescendants[] = $line; // collect only direct descendants of current level parent member
        }
    }
    if ($directDescendants) {
        $parent['children'] = recurse($directDescendants, $level + 1);
    }
    return $tree;
}

var_export(recurse($array));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'name' => 'Grandparent #1', ), 1 => array ( 'name' => 'Grandparent #2', 'children' => array ( 0 => array ( 'name' => 'Parent #2-1', 'children' => array ( 0 => array ( 'name' => 'Child #2-1-1', ), ), ), 1 => array ( 'name' => 'Parent #2-2', 'children' => array ( 0 => array ( 'name' => 'Child #2-2-1', ), 1 => array ( 'name' => 'Child #2-2-2', ), ), ), 2 => array ( 'name' => 'Parent #2-3', ), 3 => array ( 'name' => 'Parent #2-4', ), ), ), 2 => array ( 'name' => 'Grandparent #3', 'children' => array ( 0 => array ( 'name' => 'Parent #3-1', ), ), ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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