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@ 2016-08-04T05:27:57Z

<?php
$locations = [
    ['country'=>'USA', 'state'=>'New York', 'city'=>'NYC', 'location'=>'Central Park', 'street'=>'7th Ave',  'count'=>123],
    ['country'=>'USA', 'state'=>'Maryland', 'city'=>'Baltimore', 'location'=>'Harber', 'count'=>24],
    ['country'=>'USA', 'state'=>'Michigan', 'city'=>'Lansing', 'location'=>'Midtown', 'building'=>'H2B', 'count'=>7],
    ['country'=>'France', 'state'=>'Sud', 'city'=>'Marseille', 'location'=>'Centre Ville', 'count'=>12],
];

$hierarchy = array();

$levels = array_reverse(
    array('country', 'state', 'city', 'location')
);

$lastLevel = 'count';


foreach ( $locations as $L )
{
    $array = $L[$lastLevel];

    foreach ( $levels as $level )
    {
        $array = array($L[$level] => $array);
    }

    $hierarchy = array_merge_recursive($hierarchy, $array);
}

print_r($hierarchy);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [USA] => Array ( [New York] => Array ( [NYC] => Array ( [Central Park] => 123 ) ) [Maryland] => Array ( [Baltimore] => Array ( [Harber] => 24 ) ) [Michigan] => Array ( [Lansing] => Array ( [Midtown] => 7 ) ) ) [France] => Array ( [Sud] => Array ( [Marseille] => Array ( [Centre Ville] => 12 ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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