Filter each search term for a SearchWP search

gistfile1.php

<?php

function my_searchwp_term_in( $term, $engine, $original_term ) {
	
	// $term is an array because other filters may have broadened the search already (e.g. LIKE Terms extension)
	// $original_term is the original, unaltered term
	
	// if someone searched for "NYC" we need to convert it to "New York City"
	// because we never write "NYC" and always write "New York City"
	if ( 'nyc' == strtolower( $original_term ) ) {
		$term = explode( ' ', 'New York City' ); // keep it an array
	}
	
	return $term;
}

add_filter( 'searchwp_term_in', 'my_searchwp_term_in' );