(PHP 8 >= 8.2.0)
libxml_get_external_entity_loader — Get the current external entity loader
Get external entity loader previously installed by libxml_set_external_entity_loader().
此函数没有参数。
The external entity loader previously installed by
libxml_set_external_entity_loader(). If that function was
never called, or if it was called with null, null will be returned.