PHP-日期/时间条件

我有此代码,并且仅当请求的操作在特定日期进行时,我才想执行SQL查询. (例如,如果我将日期设置为4.05.2015,则仅在当天进行查询；如果我尝试在5.05.2015进行查询,则不会发生任何情况.
建议

$con = MysqL_connect($db_hostname,$db_username,$db_password);
if (!$con)
  {
  die('Could not connect: ' . MysqL_error());
  }
MysqL_select_db($db_database, $con);

$sql2 = "UPDATE `nume` SET `venit3` = '".$_GET['Box3']."' WHERE `nr` = '".$_GET['nr']."';";
MysqL_query($sql2);

解决方法:

$date = "2015-05-05";
$today = date('Y-m-d');

if ($date == $today){

$con = MysqL_connect($db_hostname,$db_username,$db_password);
if (!$con)
  {
  die('Could not connect: ' . MysqL_error());
  }
MysqL_select_db($db_database, $con);

$sql2 = "UPDATE `nume` SET `venit3` = '".$_GET['Box3']."' WHERE `nr` = '".$_GET['nr']."';";
MysqL_query($sql2);

}