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@ 2019-04-22T12:18:23Z

<?php 
$locations = Array(
        Array
            (
                'id' => 14,
                'post_id' => 319,
                'location' => 'Atlanta, GA',
                'address' => '161 Racetrack Rd., McDonough',
                'city' => 'Atlanta',
                'state' => 'Georgia',
                'state_code' =>'GA',
                'country' => 'USA',
                'zipcode' => 30253,
                'service_zipcode' => '',
                'phone' => '',
                'fax' => '',
                'email' => '',
                'facebook' => '',
                'twitter' => '',
                'linkedin' => '',
                'gplus' => '',
                'latitude' => '',
                'longitude' => '',
                'url' => '',
                'created_at' => '2019-04-22 07:22:55',
                'updated_at' => '2019-04-22 07:26:31',
            ),
            Array
            (
                'id' => 16,
                'post_id' => 321,
                'location' => 'Augusta, Georigia',
                'address' => '1446 Harper Street',
                'city' => 'Augusta',
                'state' => 'Georigia',
                'state_code' => 'GA',
                'country' => 'USA',
                'zipcode' => '',
                'service_zipcode' => '',
                'phone' => '',
                'fax' => '',
                'email' => '',
                'facebook' => '',
                'twitter' => '',
                'linkedin' => '',
                'gplus' => '',
                'latitude' => '',
                'longitude' => '',
                'url' => '',
                'created_at' => '2019-04-22 07:29:33',
                'updated_at' => '2019-04-22 07:32:25',
            ),
            Array
            (
                'id' => 12,
                'post_id' => 317,
                'location' => 'Savannah, Georgia',
                'address' => '834 Northside Dr. East, Statesboro',
                'city' => 'Savannah',
                'state' => 'Georgia',
                'state_code' => 'GA',
                'country' => 'USA',
                'zipcode' => 30458,
                'service_zipcode' => '',
                'phone' => '',
                'fax' => '',
                'email' => '',
                'facebook' => '',
                'twitter' => '',
                'linkedin' => '',
                'gplus' => '',
                'latitude' => '',
                'longitude' => '',
                'url' => '',
                'created_at' => '2019-04-22 07:15:43',
                'updated_at' => '2019-04-22 07:18:11',
            )

    );
$hierarchy = [];
if (! empty($locations)) {
 foreach ($locations as $location) {
  $hierarchy[$location['country']][$location['state']] = $location;
 }
}

if (! empty($hierarchy)) {
 foreach ($hierarchy as $country => $location) {
  echo "<br/>" . $country;
  if (! empty($hierarchy[$country])) {
   foreach ($hierarchy[$country] as $state => $city) {
    echo "<br/>--> " . $state;
    echo "<br/>----> " . $city['city'];
   }
  }
 }
}

Output for git.master, git.master_jit, rfc.property-hooks: <br/>USA<br/>--> Georgia<br/>----> Savannah<br/>--> Georigia<br/>----> Augusta

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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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