Fixed previous commit may delete unwanted cookies.

Author: Yasuo Ohgaki

ext/session/session.c

@@ -1275,6 +1275,49 @@ static int php_session_cache_limiter(TSRMLS_D) /* {{{ */
 #define COOKIE_SECURE	"; secure"
 #define COOKIE_HTTPONLY	"; HttpOnly"
 
+/*
+ * Remove already sent session ID cookie.
+ * It must be directly removed from SG(sapi_header) because sapi_add_header_ex()
+ * removes all of matching cookie. i.e. It deletes all of Set-Cookie headers.
+ */
+static void php_session_remove_cookie() {
+	sapi_header_struct *header;
+	zend_llist *l = &SG(sapi_headers).headers;
+	zend_llist_element *next;
+	zend_llist_element *current;
+	char *session_cookie, *e_session_name;
+	int session_cookie_len, len = sizeof("Set-Cookie")-1;
+
+	e_session_name = php_url_encode(PS(session_name), strlen(PS(session_name)), NULL);
+	spprintf(&session_cookie, 0, "Set-Cookie: %s=", e_session_name);
+	efree(e_session_name);
+
+	session_cookie_len = strlen(session_cookie);
+	current = l->head;
+	while (current) {
+		header = (sapi_header_struct *)(current->data);
+		next = current->next;
+		if (header->header_len > len && header->header[len] == ':'
+			&& !strncmp(header->header, session_cookie, session_cookie_len)) {
+			if (current->prev) {
+				current->prev->next = next;
+			} else {
+				l->head = next;
+			}
+			if (next) {
+				next->prev = current->prev;
+			} else {
+				l->tail = current->prev;
+			}
+			sapi_free_header(header);
+			efree(current);
+			--l->count;
+		}
+		current = next;
+	}
+	efree(session_cookie);
+}
+
 static void php_session_send_cookie(TSRMLS_D) /* {{{ */
 {
 	smart_str ncookie = {0};
@@ -1343,7 +1386,8 @@ static void php_session_send_cookie(TSRMLS_D) /* {{{ */
 
 	smart_str_0(&ncookie);
 
-	sapi_add_header_ex(ncookie.c, ncookie.len, 0, 1 TSRMLS_CC);
+	php_session_remove_cookie(); /* remove already sent session ID cookie */
+	sapi_add_header_ex(ncookie.c, ncookie.len, 0, 0 TSRMLS_CC);
 }
 /* }}} */