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@ 2019-07-29T09:48:29Z

<?php

$arr = [
   [
        'cards1' => [
            'A',
            'b',
            'c'
        ],
        'cards2' => [
            'A',
            'e',
            'd'
        ],
        'cards3' => [
            'A',
            'o',
            'l'
        ]
    ],
    [
         'cards1' => [
            'A',
            'b',
            'c'
        ],
        'cards2' => [
            'A',
            'r',
            'c'
        ],
        'cards3' => [
            'A',
            'bbb',
            'yyy'
        ]
    ],
    [
         'cards1' => [
            'A',
            'bbb',
            'ggg'
        ],
        'cards2' => [
            'A',
        ],
        'cards3' => [
            'A',
        ]    
    ]
];

$set = [];

foreach($arr as &$data){
    foreach($data as &$cards){
        foreach($cards as $index => $value){
            if(isset($set[$value])) unset($cards[$index]);
            else  $set[$value] = true;
        }
    }
}

print_r($arr);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [cards1] => Array ( [0] => A [1] => b [2] => c ) [cards2] => Array ( [1] => e [2] => d ) [cards3] => Array ( [1] => o [2] => l ) ) [1] => Array ( [cards1] => Array ( ) [cards2] => Array ( [1] => r ) [cards3] => Array ( [1] => bbb [2] => yyy ) ) [2] => Array ( [cards1] => Array ( [2] => ggg ) [cards2] => Array ( ) [cards3] => Array ( ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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