add filters in the search (custom fields)

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Bids
26
Avg Bid (USD)
$120
Project Budget (USD)
$30 - $250

Project Description:
Hello,

I need to extend the search of a website, filtering the results with the custom fields (checkboxes).
I've made it to work in the result page but i want it to be in the header, so OUTSIDE the loop.
I will provide further details + url in private. Only serious bidders

Skills required:
CSS, HTML, PHP, Wordpress
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