Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0
session的错误。什么原因。现在，别的页面取不到值


$ds=date("Y")."-".date("d")."-".date("m");

echo $money-$ds;
$money 是个字段类型 date
日期怎么比较？