Online PHP editor | output for J9RMQ

@ 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 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: 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', ), ), ), )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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