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@ 2019-02-12T06:57:56Z

<?php
$array = array(
    "a" => "xxx",
    "b" => "xxx",
    "c" => array(
        "g" => "xxx",
        "a" => "xxx",
        "h" => "xxx",
    ),
    "d" => "xxx",
    "e" => array(
        "i" => array(
            "a" => "xxx",
            "k" => array(
                "l" => "xxx",
                "b" => "xxx",
            ),
        ),
        "j" => "xxx",
    ),
    "f" => "xxx",
    'h' => array(
        'p' => 'xxx',
        'n' => 'xxx'
        )
);
function remove_dup_keys(&$array, &$keys = array()) {
    foreach ($array as $key => &$value) {
        if (in_array($key, $keys)) {
            unset($array[$key]);
        }
        else {
            $keys[] = $key;
        }
    }
    foreach ($array as $key => &$value) {
        if (is_array($value)) {
            remove_dup_keys($value, $keys);
        }
    }
}

remove_dup_keys($array);
print_r($array);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [a] => xxx [b] => xxx [c] => Array ( [g] => xxx ) [d] => xxx [e] => Array ( [i] => Array ( [k] => Array ( [l] => xxx ) ) [j] => xxx ) [f] => xxx [h] => Array ( [p] => xxx [n] => xxx ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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