how about change your code like this
// Get the current value of likes from articles with a match id of $_GET['id']
if(!$result = mysql_query('SELECT `likes` FROM `articles` WHERE `id` = "'.mysql_real_escape_string($_GET['id']).'"')) die('Invalid query: ' . mysql_error());
$row =...
How about testing your code first if its reaching the insertion by modifying some line temporarily like this.
$res_array = $memberQuery->fetchColumn(4);
if ($res_array<'2') {
//header("location:main.php");
die('Cant reach insert because ($res_array<\'2\') is true');
}
if...
