Macro for php expansion return value in zend engine

ZEND_API provides parameter return method

Set the return value and end the function	Set the return value	Macro return type and parameters
RETURN_LONG(l)	RETVAL_LONG(l)	Integer
RETURN_BOOL(b)	RETVAL_BOOL(b)	Boolean number (1 or 0)
RETURN_NULL()	RETVAL_NULL()	NULL
RETURN_DOUBLE(d)	RETVAL_DOUBLE(d)	Floating point number
RETURN_STRING(s, dup)	RETVAL_STRING(s, dup)	String. If dup is 1, the engine will call estrdup() to repeat s, using copy. If dup is 0, use s
RETURN_STRINGL(s, l, dup)	RETVAL_STRINGL(s, l, dup)	a string value of length l. Same as the previous macro, but faster because the length of s is specified.
RETURN_TRUE	RETVAL_TRUE	Returns boolean true. Notice that this macro has no parentheses.
RETURN_FALSE	RETVAL_FALSE	Returns boolean false. Notice that this macro has no parentheses.
RETURN_RESOURCE(r)	RETVAL_RESOURCE(r)	Resource handle.

The above introduces the macro of the PHP expansion return value in the zend engine, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.