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@ 2019-09-01T05:23:30Z

<?php
$a = Array
(
    '0' => Array
        (
            'name' => 'Viettel',
            'data' => Array
                (
                    '0' => '1559881644000,500'
                )

        ),

    '1' => Array
        (
            'name' => 'FPT',
            'data' => Array
                (
                    '0' => '1559994465000,172'
                )

        ),

    '2' => Array
        (
            'name' => 'MobiFone',
            'data' => Array
                (
                    '0' => '1559997314000,11164'
                )

        ),

    '3' => Array
        (
            'name' => 'Vietnamobile',
            'data' => Array
                (
                    '0' => '1559993699000,1246'
                )

        ),

    '4' => Array
        (
            'name' => 'Viettel',
            'data' => Array
                (
                    '0' => '1560000096000,47886'
                )

        ),

    '5' => Array
        (
            'name' => 'VinaPhone',
            'data' => Array
                (
                    '0' => '1559997553000,11132'
                )

        ),

    '6' => Array
        (
            'name' => 'VNPT',
            'data' => Array
                (
                    '0' => '1559993066000,84'
                )

        )

);
$groupBy = [];
foreach($a as $v){
	array_key_exists($v['name'], $groupBy) ? 
		array_push($groupBy[$v['name']]['data'], $v['data'][0])
	:
		($groupBy[$v['name']] = $v)
	;
}
echo '<pre>';
print_r(array_values($groupBy));

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [0] => Array ( [name] => Viettel [data] => Array ( [0] => 1559881644000,500 [1] => 1560000096000,47886 ) ) [1] => Array ( [name] => FPT [data] => Array ( [0] => 1559994465000,172 ) ) [2] => Array ( [name] => MobiFone [data] => Array ( [0] => 1559997314000,11164 ) ) [3] => Array ( [name] => Vietnamobile [data] => Array ( [0] => 1559993699000,1246 ) ) [4] => Array ( [name] => VinaPhone [data] => Array ( [0] => 1559997553000,11132 ) ) [5] => Array ( [name] => VNPT [data] => Array ( [0] => 1559993066000,84 ) ) )

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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2016-08-14 Arrow functions - withdrawn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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