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@ 2016-10-27T12:54:24Z

<?php

$subregion = [
    [
        "subregion_id"   => "8",
        "subregion_name" => "NORTH_AMERICA",
        "subregion_abbr" => "US"
    ],
    [
        "subregion_id"   => "9",
        "subregion_name" => "NORTH_AMERICA",
        "subregion_abbr" => "CA"
    ],
    [
        "subregion_id"   => "6",
        "subregion_name" => "WE",
        "subregion_abbr" => "South"
    ],
    [
        "subregion_id"   => "0",
        "subregion_name" => null,
        "subregion_abbr" => null
    ],
    [
        "subregion_id"   => "5",
        "subregion_name" => "WE",
        "subregion_abbr" => "North"
    ],
    [
        "subregion_id"   => "0",
        "subregion_name" => null,
        "subregion_abbr" => null
    ]
];

$unique = array_map("unserialize", array_unique(array_map("serialize", $subregion)));
$unique = array_map(function($v) { return array_filter($v, 'is_not_null'); }, $unique);

print_r($unique);

function is_not_null($var)
{
    return null !== $var;
}

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [subregion_id] => 8 [subregion_name] => NORTH_AMERICA [subregion_abbr] => US ) [1] => Array ( [subregion_id] => 9 [subregion_name] => NORTH_AMERICA [subregion_abbr] => CA ) [2] => Array ( [subregion_id] => 6 [subregion_name] => WE [subregion_abbr] => South ) [3] => Array ( [subregion_id] => 0 ) [4] => Array ( [subregion_id] => 5 [subregion_name] => WE [subregion_abbr] => North ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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