note 66453 added to function.is-numeric

hello, I want to make two buttons delete and edit.there is not a syntax error, but it appears the error message of echo "this page has accessed in error!", if I write an echo command before if command the message i wrote appears.Probably there is a problem with &_GET or the command (is_numeric($_POST['id'])). here is the code with the error message: if((isset($_GET['id']))&&C) ){ $id=$_GET['id']; }elseif((isset($_POST['id']))&&(is_numeric($_POST['id'])) ){ $id=$_POST['id']; }else{ echo '<h1>page error</h1><p class="error">this page has accessed in error!</p>'; exit(); } ---- Server IP: 83.171.240.155 (proxied: 1.0 ACEISA) Probable Submitter: 192.168.2.200 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.is-numeric.php Edit -- http://master.php.net/note/edit/66453 Del: integrated -- http://master.php.net/note/delete/66453/integrated Del: useless -- http://master.php.net/note/delete/66453/useless Del: bad code -- http://master.php.net/note/delete/66453/bad+code Del: spam -- http://master.php.net/note/delete/66453/spam Del: non-english -- http://master.php.net/note/delete/66453/non-english Del: in docs -- http://master.php.net/note/delete/66453/in+docs Del: other reasons-- http://master.php.net/note/delete/66453 Reject -- http://master.php.net/note/reject/66453 Search -- http://master.php.net/manage/user-notes.php