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@ 2021-10-20T12:32:19Z

<?php

$input1 = ['hotels' => [
    'hotel' => [
        [ "ort" => "rom", "lioc" => "inrom" ],
        [ "ort" => "paris", "lioc" => "inpsrisd" ],
        [ "ort" => "berlin", "lioc" => "inberlin" ],
        [ "ort" => "milano", "lioc" => "inmilano" ],
        [ "ort" => "paris", "lioc" => "anotherinpsrisd"],
        [ "ort" => "muc", "lioc" => "inmuc"]
    ]
]];

$input2 = ['hotels' => [
    'hotel' => [
        [ "ort" => "rom", "lioc" => "inrom" ],
        [ "ort" => "beijing", "lioc" => "wanda" ]
    ]
]];

function recursiveUnique($input): array
{
    // if the input is not an array, just return the input
    if (!is_array($input)) {
        return $input;
    }
    // check if the array is a list or an associative array
    else if (count($input) === 0 || array_keys($input) === range(0, count($input) - 1)) {
        return array_values(array_unique($input, SORT_REGULAR));
    }
    else {
        foreach ($input as $key => $value) {
            $input[$key] = recursiveUnique($value);
        }
        return $input;
    }
}

var_dump(recursiveUnique(array_merge_recursive($input1, $input2)));

Output for git.master, git.master_jit, rfc.property-hooks: array(1) { ["hotels"]=> array(1) { ["hotel"]=> array(7) { [0]=> array(2) { ["ort"]=> string(3) "rom" ["lioc"]=> string(5) "inrom" } [1]=> array(2) { ["ort"]=> string(5) "paris" ["lioc"]=> string(8) "inpsrisd" } [2]=> array(2) { ["ort"]=> string(6) "berlin" ["lioc"]=> string(8) "inberlin" } [3]=> array(2) { ["ort"]=> string(6) "milano" ["lioc"]=> string(8) "inmilano" } [4]=> array(2) { ["ort"]=> string(5) "paris" ["lioc"]=> string(15) "anotherinpsrisd" } [5]=> array(2) { ["ort"]=> string(3) "muc" ["lioc"]=> string(5) "inmuc" } [6]=> array(2) { ["ort"]=> string(7) "beijing" ["lioc"]=> string(5) "wanda" } } } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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