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@ 2018-06-02T08:31:35Z

<?php

$arrays = [
    252 => [
        0 => [
            "id" => 2929850,
            "titulo" => " Film 1"
        ],
        1 => [
            "id" => 2929848,
            "titulo" => "Film 2"
        ]
    ],
    251 => [
        0 => [
            "id" => 2929796,
            "titulo" => "Film 3"
        ],
        1 => [
            "id" => 2929795,
            "titulo" => "Film 4"
        ]
    ]
];

$result = [];
foreach ($arrays as $key =>  $array) {
    $result[$key] = array_keys($array);
}

print_r($result);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

70.78 ms | 402 KiB | 5 Q