php - Get Hyphenated column values in Laravel -

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i'm trying hyphenated column values in laravel application. i'm not able it.

$result->reference works fine.

but when try $result->product-id returns

undefined property: stdclass::$product

when tried $result->{'product-id'}

object of class stdclass not converted string

how can value?

this should work: 

$result->getattribute('product-id');

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