Online PHP editor | rfc for uJh5r

@ 2025-05-09T17:01:11Z

<?php

class DebugHelper
{
    public function mapShallow($value, int $maxDepth, &$seenObjects = [])
    {
        if (is_object($value)) {
            $oid = spl_object_id($value);

            $className = get_class($value) . '#' . $oid;

            if ($seenObjects[$oid] ?? false) {
                return '**recursive class: ' . $className . '**';
            }

            $seenObjects[$oid] = true;

            if ($maxDepth <= 0) {
                return '**class: ' . $className . '**';
            }

            $value = array_merge(['**class**' => $className], (array) $value);
        } elseif (!is_array($value)) {
            return $value;
        }

        if ($maxDepth <= 0) {
            return '**array of size: ' . count($value) . '**';
        }

        $res = [];

        $unseenObjects = [];
        foreach ($value as $k => $v) {
            if (is_object($v)) {
                $oid = spl_object_id($v);

                if (!($seenObjects[$oid] ?? false)) {
                    $unseenObjects[$k] = true;
                }
            }

            $res[$k] = $this->mapShallow($v, -1, $seenObjects);
        }

        foreach ($value as $k => $v) {
            if (!is_object($v) && !is_array($v)) {
                continue;
            }

            $seenObjects2 = $seenObjects;
            if (is_object($v) && ($unseenObjects[$k] ?? false)) {
                unset($seenObjects2[spl_object_id($v)]);
            }

            $res[$k] = $this->mapShallow($v, $maxDepth - 1, $seenObjects2);
        }

        return $res;
    }
}

$dt = new \DateTime('2000-02-20 10:00');
$arr = [
    'foo',
    [1, 2, [3]],
    [$dt],
    $dt,
];

print_r((new DebugHelper())->mapShallow($arr, 2));

Output for git.master_jit, git.master, rfc.property-hooks: Array ( [0] => foo [1] => Array ( [0] => 1 [1] => 2 [2] => **array of size: 1** ) [2] => Array ( [0] => **recursive class: DateTime#1** ) [3] => Array ( [**class**] => DateTime#1 [date] => 2000-02-20 10:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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