php_sapi_name
Returns a lowercase string that describes the type of interface (the Server API, SAPI) that PHP is using. For example, in CLI PHP this string will be "cli" whereas with Apache it may have several different values depending on the exact SAPI used. Possible values are listed below.
Parameters
This function has no parameters.
Return Values
Returns the interface type, as a lowercase string, or false on failure.
Although not exhaustive, the possible return values include apache, apache2handler, cgi (until PHP 5.3), cgi-fcgi, cli, cli-server, embed, fpm-fcgi, litespeed, phpdbg.
Notes
Note:
An alternative approachThe PHP constant PHP_SAPI has the same value as php_sapi_name.
The defined SAPI may not be obvious, because for example instead of apache it may be defined as apache2handler.