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 );