How to save unchecked value of checkbox - HTML

Working with form check boxes can be a bit of a pain on sites with dynamic content. Saving the checked data is easy, but how do you easily save the unchecked value without manually adding it to an array from inside your code.
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In Magento, whenever you change the searchable attributes of product from admin panel, you need to re-index data

Magento Gyaan !

In Magento, whenever you change the searchable attributes of product from admin panel, you need to re-index data using following step system->index management otherwise it will not work.