WP Job Manager search all meta keys in keyword search box (or add your own meta keys to search)

functions.php

<?php
// ^ there should ONLY be one of these at the top of your functions.php file

add_filter( 'job_listing_searchable_meta_keys', 'smyles_allow_search_all_meta' );

function smyles_allow_search_all_meta( $meta_keys ) {

	// Below is the default array of meta keys that will be passed
	// to search.  You can either add your own to the array, or return
	// false to force WP Job Manager to search all meta keys
	//
	// $meta_keys = array(
	//	'_job_location',
	//	'_company_name',
	//	'_application',
	//	'_company_name',
	//	'_company_tagline',
	//	'_company_website',
	//	'_company_twitter',
	//);

	// We can return FALSE to force to search all meta keys:
	$meta_keys = false;
	// You can also add your own meta keys to search like this (just uncomment line below, and comment out or remove line above):
	// $meta_keys[] = '_my_meta_key1';
	// $meta_keys[] = '_my_meta_key2';
	
	return $meta_keys;
}