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@ 2017-11-14T20:59:50Z

<?php

$bestsellers = [
    (object) [ 'product_id' => 178, 'order_item_qty' => 9],
    (object) [ 'product_id' => 233, 'order_item_qty' => 4],
    (object) [ 'product_id' => 179, 'order_item_qty' => 1],
];

$ids = array_column($bestsellers, 'product_id');

var_dump($ids);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_column: documentation ( source)

preferences:dark modelive preview

83.08 ms | 402 KiB | 5 Q