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@ 2017-07-12T22:04:43Z

<?php

$story = [
    'documents' => [
        [
            'authors' => [
                ['id' => 2411],
                ['id' => 24116],
                ]
            ]
        ]
    ];
    $value = array_column($story['documents'], 'authors')[0];
    print_r(array_column($value, 'userId'));

Output
Performance
VLD
References
Branches

array_column: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

40.98 ms | 402 KiB | 5 Q