typedef size_t (*php_http_pass_callback_t)(void *cb_arg, const char *str, size_t len);
typedef size_t (*php_http_pass_php_http_buffer_callback_t)(void *cb_arg, php_http_buffer_t *str);
+typedef size_t (*php_http_pass_format_callback_t)(void *cb_arg, const char *fmt, ...);
typedef struct php_http_pass_fcall_arg {
zval *fcz;