function isnum($value)
{
if (!is_array($value) && strlen($value)<=19)
return (preg_match("/^[0-9]+$/", $value));
else
return false;
}
if (!isset($_GET['rowstart']) || !isnum($_GET['rowstart'])) { $_GET['rowstart'] = 0; }
if (!isset($_GET['rowstart']) || !isnum($_GET['rowstart']) || $_GET['rowstart'] > $rows) { $_GET['rowstart'] = 0; }
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