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@ 2015-04-15T15:36:00Z

<?php

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

$result = [];
$prevKey = 0;
array_walk_recursive($array, function ($value, $key) use (&$result, &$prevKey) {
    if (!is_array($value)) {
       
    }else {
        $prevKey = $key;
        echo $prevKey;
    }
});

var_dump($result);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_walk_recursive: documentation ( source)

preferences:dark modelive preview

57.71 ms | 402 KiB | 5 Q