Some other projects, such as Zephir, offer the capacity for PHP extensions to be produced in a top-level language and also assembled into indigenous PHP expansions. Such a method, as opposed to writing PHP extensions directly in C, streamlines the development of extensions as well as decreases the moment required for shows and also screening. PHP's single-request-per-script-execution model, and also the reality the Zend Engine is an interpreter, results in inefficiency; consequently, numerous items have been developed to assist improve PHP efficiency.