note 44256 added to zend.arguments.retrieval

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. ---- Manual Page -- http://www.php.net/manual/en/zend.arguments.retrieval.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+44256 Delete -- http://master.php.net/manage/user-notes.php?action=delete+44256&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+44256&report=yes Search -- http://master.php.net/manage/user-notes.php