mysql_insert_id（）; / last_insert_id（）; 没有任何已知问题，不会返回最新的ID

Question

mysql_insert_id(); / last_insert_id(); isn't returning latest ID without any known issue

$insert = "INSERT into `table` (`name`,`address`) VALUES ('$name', '$address')";                    mysql_select_db($database_A, $A);
$result = mysql_query($insert,$A) or die mysql_error();
$latest_id = mysql_insert_id($A); 
var_dump($latest_id);   

According to PHP manual I see any reason in the code why it's not returning the latest ID, instead it's always returning NULL or 0. It's happening in case of last_insert_id(); too.

This function returns 0 if the previous operation does not generate an AUTO_INCREMENT ID, or FALSE on MySQL connection failure.

Any idea?