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@ 2019-10-20T05:48:00Z

<?php

$a = Array
    (
        'piata-fortei-munca' => Array
            (
                '0' => Array
                    (
                        'date' => '2019-10-19 09:10:07',
                        'user' => '61006cd2ac1728c3c08c2e8d9d714a81',
                        'slug' => 'piata-fortei-munca'
                    ),

                '1' => Array
                    (
                        'date' => '2019-10-19 09:10:07',
                        'user' => '61006cd2ac1728c3c08c2e8d9d714a81',
                        'slug' => 'piata-fortei-munca'
                    ),

                '2' => Array
                    (
                        'date' => '2019-10-19 09:10:09',
                        'user' => 'a8b6c2879aa0f38da1fd49a4e86e1525',
                        'slug' => 'piata-fortei-munca'
                    ),

                '3' => Array
                    (
                        'date' => '2019-10-19 09:10:09',
                        'user' => 'a8b6c2879aa0f38da1fd49a4e86e1525',
                        'slug' => 'piata-fortei-munca'
                    ),

                '4' => Array
                    (
                        'date' => '2019-10-19 09:10:18',
                        'user' => '42d80d8dc9a9547223e2bfea172738cf',
                        'slug' => 'piata-fortei-munca'
                    )
        ),
		'blockchain-bitcoin' => Array
        (
            '0' => Array
                (
                    'date' => '2019-10-19 08:10:58',
                    'user' => '4b01473f1d3f1846b1e83b33e1af0b11',
                    'slug' => 'blockchain-bitcoin'
                ),

            '1' => Array
                (
                    'date' => '2019-10-19 08:10:58',
                    'user' => '4b01473f1d3f1846b1e83b33e1af0b11',
                    'slug' => 'blockchain-bitcoin'
                )

        )
);
array_walk($a, function(&$v ,$k){
	$v  = array_values(array_column($v, null, 'user'));
});
print_r($a);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [piata-fortei-munca] => Array ( [0] => Array ( [date] => 2019-10-19 09:10:07 [user] => 61006cd2ac1728c3c08c2e8d9d714a81 [slug] => piata-fortei-munca ) [1] => Array ( [date] => 2019-10-19 09:10:09 [user] => a8b6c2879aa0f38da1fd49a4e86e1525 [slug] => piata-fortei-munca ) [2] => Array ( [date] => 2019-10-19 09:10:18 [user] => 42d80d8dc9a9547223e2bfea172738cf [slug] => piata-fortei-munca ) ) [blockchain-bitcoin] => Array ( [0] => Array ( [date] => 2019-10-19 08:10:58 [user] => 4b01473f1d3f1846b1e83b33e1af0b11 [slug] => blockchain-bitcoin ) ) )

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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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