PHP中常见的未定义索引错误[重复]

When I am using my code in wamp (old php 3.2 may be) there is no warning or note but when I run the same code it is giving me a warning or a note:

Notice: Undefined index: emailseaech in C:\xampp\htdocs\employee\RecruitingProcess\manageuser\pages\defaultresume.php on line 6

for this

$emailseaech = $_GET["emailseaech"];

I am using ajax http to read the date passing value.

</div>

$emailseaech = '';
if(!empty($_GET["emailseaech"]))
    $emailseaech=$_GET["emailseaech"];