php validate integer

Question

I`m wonder why this not working

    echo gettype($_GET[\'id\']); //returns string
  if(is_int($_GET[\'id\']))
  {
   echo \'Integer\';
  }

Answer 1

Try:

if(isNumeric($_GET['id'])) {
    $cast_int = (int)$_GET['id'];
}

if(isset($cast_int)) {
    echo gettype($cast_int)."
\n";
    if(is_int($cast_int))
    {
        echo 'Integer'."
\n";
    }
} else {
    echo gettype($_GET['id'])." was passed
\n";
}

function isNumeric($numeric) {
    return preg_match("/^[0-9]+$/", $numeric);
}