Force quoted search logic in SearchWP when applicable

searchwp-customizations.php

<?php

// Force multiple word searches to use quoted search logic if quotes are not added.
// NOTE: Quoted search must be enabled (checkbox on the Advanced tab)
add_filter(
	'searchwp\query\search_string',
	function( $search_string, $query ) {
		// If there are already quotes, bail out.
		if ( false !== strpos( $search_string, '"' ) ) {
			return $search_string;
		}

		// If there's only one word, bail out.
		if ( false === strpos( $search_string, ' ') ) {
			return $search_string;
		}

		return '"' . $search_string . '"';
	},
	30, 2
);