pluck() 获取某列值
$collection = collect([
['product' => 'Desk', 'price' => 200],
['product' => 'Chair', 'price' => 100],
['product' => 'Bookcase', 'price' => 150],
['product' => 'Door', 'price' => 100],
]);
$result = $collection->pluck('product')->all();
//["Desk","Chair","Bookcase","Door"];
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