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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 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 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 ) ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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