Tell SearchWP to exclude password protected results

searchwp-customizations.php

<?php

// Tell SearchWP to exclude password protected results.
add_filter( 'searchwp\query\mods', function( $mods ) {
	global $wpdb;

	$mod = new \SearchWP\Mod();
	$mod->set_local_table( $wpdb->posts );
	$mod->on( 'ID', [ 'column' => 'id' ] );
	$mod->raw_where_sql( function( $runtime ) {
		return "LENGTH({$runtime->get_local_table_alias()}.post_password) = 0";
	} );

	$mods[] = $mod;

	return $mods;
} );