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@ 2015-04-15T15:39:39Z

<?php

$array = [
    1 => [
        1 => [
            'anna',
            'alice'
        ],
        2 => [
            'bob',
            'bartold'
        ]
    ],
    2 => [
        1 => [
            'carol'
        ],
        2 => [
            'david'
        ]
    ]
];

$result = [];

$iterator = new \RecursiveIteratorIterator(
    new \RecursiveArrayIterator($array)
);

foreach ($iterator as $row) {
    $result[] = $row;
}


var_dump($result);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

43.9 ms | 402 KiB | 5 Q