spl_autoload Default implementation for __autoload() &reftitle.description; voidspl_autoload stringclass stringnullfile_extensions&null; This function is intended to be used as a default implementation for __autoload. If nothing else is specified and spl_autoload_register is called without any parameters then this function will be used for any later call to __autoload. &reftitle.parameters; class The lowercased name of the class (and namespace) being instantiated. file_extensions By default it checks all include paths to contain filenames built up by the lowercase class name appended by the filename extensions .inc and .php. &reftitle.returnvalues; &return.void; &reftitle.errors; Throws LogicException when the class is not found and there are no other autoloaders registered. &reftitle.changelog; &Version; &Description; 8.0.0 file_extensions is now nullable.