/*
* explain some code
* @param code the file or code to explain
* @param type the type of $code EXPLAIN_FILE or EXPLAIN_STRING
* @param classes array of classes created by compilation of code
* @param functions array of functions created by compilation of code
* @return array
*/
function explain($code, $type = EXPLAIN_FILE, &$classes = array(), &$functions = array());
/*
* explain_opcode
* @param opcode the opcode
* @return string
*/
function explain_opcode($opcode);
/*
* explain_optype
* @param optype the optype
* @return string
*/
function explain_optype($optype);