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run code in 300+ PHP versions simultaneously

@ 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);

print_r: documentation ( source)

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