SAPRFC is a extension module for PHP 4 and PHP 5. With SAPRFC is possible call ABAP function modules in SAP R/3 from PHP scripts. You can use the powerful PHP language to create a web applications or interface programs with a connectivity to the SAP R/3. You can also write RFC server program in PHP and call PHP functions from SAP R/3.
SAP R/3 release above 4.0B supported (it may be work for earlier versions but it hasn't been tested)
use RFC (Remote Function Call) API to make call
discover interface of a function module
map RFC types to PHP strings
server API for calling PHP functions from ABAP
support for transactional RFC (client and server)
portability: except ZEND API and RFC API use only a few standard C functions
delivered with the test script saprfc_test.php that has the similar function as "Single Test" option in SE37 transaction (Function Builder).