Errore su controllo if

[Lino80]

senza if e else funziona la query,
solo con

$insert = "insert into accounting (`photoLimit`,`item`,`payment_gross`,`payment_status`,`active`,`payment_date`,`mid`,`title`,`description`,`days`,`numCredit`) 
                        values (".$credit['photoLimit'].",'3','0','FREE','Yes',NOW(),".$_SESSION['memberID'].",'".$credit['title']."','".$credit['description']."',".$credit['days'].",".$credit['numCredit'].")";
    //echo $insert;
    mysql_query($insert,$myconn) or die(mysql_error());
    
    $updateSQL = sprintf("UPDATE members SET `expires`=DATE_ADD(NOW(), INTERVAL ".$credit['days']." DAY) WHERE id=%s",
                                  $_SESSION['memberID']);

                       mysql_query($updateSQL,$myconn) or die(mysql_error());
                       
    $insertGoTo = "a_index.php";
    header(sprintf("Location: %s", $insertGoTo));
    function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  $theValue = (!get_magic_quotes_gpc()) ? addslashes($theValue) : $theValue;

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
} 

funziona... com'è possibile?