SaPI

SAPI is an acronym used in several technical domains. The two most common references are PHP's Server API and Microsoft's Speech Application Programming Interface.

PHP Server API: The SAPI defines the interface between the PHP interpreter and the web server or execution environment. It governs how PHP is loaded, how requests are received and processed, and how output is flushed. The SAPI can be the command line (CLI), an Apache module (mod_php), CGI or FastCGI, or PHP-FPM. Different SAPIs expose different runtime behaviors, such as available superglobals, ini settings, and resource limits.

Windows Speech API: SAPI is a set of COM-based interfaces for speech synthesis (text-to-speech) and speech recognition on Windows. SAPI 5, the widely adopted version, provides multiple voices and engines and is used by accessibility tools and applications to read text aloud or recognize spoken input.

Other uses: Depending on the context, SAPI may refer to other, less common specifications or projects, but in computing it is most often the PHP Server API or Windows Speech API.