mysql - Undefined index $_Request php -


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i seem having problem updating database because of undefined index. flow of program when user tries update existing record, redirect updateuser.php?id=$rw[id] after filing in form , pressing ok button error occurs 

notice: undefined index: id in updateuser.php on line 14

here's updateuser.php file(the part occurs).

$id=$_request['id']; //line 14 if(isset($_post['btnadd'])){ $col1=$_post['uname']; $col2=$_post['pass']; $col3=$_post['fullname']; $col4=$_post['user_type'];  include("dbcon.php");  $adduser = mysql_query("update users set user_id = '$col1', pass='$col2', fullname='$col3', user_type='$col4' id='$id'") or die(mysql_error(). " wrong input"); $msg="successfully updated"; }else{ $msg="ready updating";  }

i tried wrapping line 14 :

    if(isset($_request['id'])){           $id=$_request['id']; }

but error 

undefined variable: id

in mysql_query line

any appreciated. thank you.

wrap whole code cause if wrap line 14 $id not available if $_request['id'] not set.- 

if(!empty($_request['id'])) { $id=$_request['id']; //line 14 if(isset($_post['btnadd'])){ $col1=$_post['uname']; $col2=$_post['pass']; $col3=$_post['fullname']; $col4=$_post['user_type'];  include("dbcon.php");  $adduser = mysql_query("update users set user_id = '$col1', pass='$col2', fullname='$col3', user_type='$col4' id='$id'") or die(mysql_error(). " wrong input"); $msg="successfully updated"; }else{ $msg="ready updating";  } }

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