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@ 2022-10-12T19:48:42Z

<?php

$user = [
    'profile' => [
        'authkey' => '',
        'publickey' => '',
        'status' => 19
    ],
    'setup' => [
        'profile' => false,
        'contact' => false,
        'payments' => false,
        'subscription' => false
    ],
    'paygateway' => [
        'paypal' => [
            'publickey' =>'',
            'secretkey' => '',
            'testarray' => [
                'key1' => 'value1',
                'key2' => 'value2',
                'key3' => [
                    'key4' => 'level4'
                ]
            ],
            'webhookid' => ''
        ],    
        'stripe' => [
            'publickey' => '',
            'secretkey' => ''
        ]
    ]
];

function buildKeyPath(array $array, string $path): array
{
    $result = [];
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $result = array_merge($result, buildKeyPath($value, "{$path}[$key]"));
        } else {
            $result[] = "{$path}[$key]";
        }
    }
    return $result;
}

foreach ($user as $k => &$v) {
   $v = buildKeyPath($v, "[$k]");
}
var_export($user);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 'profile' => array ( 0 => '[profile][authkey]', 1 => '[profile][publickey]', 2 => '[profile][status]', ), 'setup' => array ( 0 => '[setup][profile]', 1 => '[setup][contact]', 2 => '[setup][payments]', 3 => '[setup][subscription]', ), 'paygateway' => array ( 0 => '[paygateway][paypal][publickey]', 1 => '[paygateway][paypal][secretkey]', 2 => '[paygateway][paypal][testarray][key1]', 3 => '[paygateway][paypal][testarray][key2]', 4 => '[paygateway][paypal][testarray][key3][key4]', 5 => '[paygateway][paypal][webhookid]', 6 => '[paygateway][stripe][publickey]', 7 => '[paygateway][stripe][secretkey]', ), )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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