note 44256 deleted from internals2.ze1.zendapi by cmb

Note Submitter: ppmm at wuxinan dot net ---- In fact, empty string is not writeable, even when we add an slash after the type decl. Say the implementation of my_test() is like this: char *s; int s_len; zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s/", &s, &s_len) and you pass an empty string my_test("") from the PHP script, then s[0] is not writeable. You will get a seg fault. The reason is that Zend doesn't emalloc a new copy of the empty string dynamically, instead it just assigns the empty_string (which is defined at compile time and located in unwriteable data seg) pointer to s.