: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in
namespace WPML\Upgrade\Commands;
class AddStringPackageIdIndexToStrings extends AddIndexToTable {
protected function get_table() {
protected function get_index() {
return 'string_package_id';
protected function get_index_definition() {
return '( `string_package_id` )';