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@ 2019-03-11T10:28:51Z

<?php



$amsterdam = [
    65 => [
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 100
        ]
    ],
    173 => [
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 2500
        ]
    ],
];

$prague    = [
    132 => [
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 2100
        ]
    ],
    956 => [
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 2500
        ]
    ],
];

$lisboa    = [
    175 => [
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 6500
        ]
    ],
    64 => [
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 20
        ]
    ],
];

$cities = [
    'amsterdam' => $amsterdam,
    'prague'    => $prague,
    'lisboa'    => $lisboa
];

function getMinimumPrice($cityArray) {
    return array_reduce($cityArray, function($carry, $item) {
        return $carry === 0 ? $item['data']['price'] : min($carry, $item['data']['price']);
    }, 0);
}

uasort($cities, function($city1, $city2) {
    $priceCity1 = getMinimumPrice($city1);
    $priceCity2 = getMinimumPrice($city2);
    
    return $priceCity1 <=> $priceCity2;
});
var_dump($cities);

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { ["lisboa"]=> array(2) { [175]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "boo" ["price"]=> int(6500) } } [64]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "hoo" ["price"]=> int(20) } } } ["amsterdam"]=> array(2) { [65]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "boo" ["price"]=> int(100) } } [173]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "hoo" ["price"]=> int(2500) } } } ["prague"]=> array(2) { [132]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "boo" ["price"]=> int(2100) } } [956]=> array(2) { ["something"]=> bool(false) ["data"]=> array(2) { ["foo"]=> string(3) "hoo" ["price"]=> int(2500) } } } }

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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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