รบกวนช่วยดูโคดหน่อยครับ ทำไมค่ามันไม่ออกครับ ช่วยทีนะครับ

$sql='';
if (isset($_POST['sub1']))  
{
	$t1 = 'SUBJECT '.$t1;
	$datel = date("Y:m:d");
	$timel =date("H:i:s");	
	$name = $_SESSION['User_Loginnew']['user_name'];
	$actt = "SEARCH DOC";
	$datet = date("Y-m-d").' '.date("H:i:s");
	$pc="INSERT INTO logdb(log_name,log_date,log_time,log_file,log_act) VALUES 	('$name','$datel','$timel','$t1','$actt')"; 
	$precon2 = mysql_query($pc);
	
$cond = array();
// search case
if (!empty($_POST['t1']))
 { $cond[] = 'doc_about like "%'.$_POST['t1'].'%"';  }
// date t2 only case
if (!empty($_POST['t2']))
 	{  
 	$tdate1 = date('Y-m-d', strtotime($_POST['t2']));
    $cond[]='doc_date >= "'.$tdate1.'" ';    
	}
// date tex3 only case
if (!empty($_POST['tex3']))
 	{  
 	$tdate2 = date('Y-m-d', strtotime($_POST['tex3']));
    $cond[]='doc_date <= "'.$tdate1.'" ';    
	}
// 2 date case
if (!empty($_POST['t2'])&& !empty($_POST['tex3']))
 	{ 
 	$tdate1 = date('Y-m-d', strtotime($_POST['t2']));
    $tdate2 = date('Y-m-d', strtotime($_POST['tex3']));
	$cond[]='doc_date between "'.$tdate1.'" and  "'.$tdate2.'"';
	}
//statusfile 1-3 1= all 2=normally 3=delete
//case statusfile = 2
if ($_POST['statusfile']==2)  { $cond[] = 'doc_status = normally';} 
//cser statusfile = 3
if ($_POST['statusfile']==3)  { $cond[] = 'doc_status = delete';} 
//uncheckbox case
if (empty($_POST['checksearch']))
   { $cond[]='doc_ref = 0'; }
   
//checkbox case
if (!empty($_POST['checksearch']))
   { 
   $cond[]='OR doc_ref = ( SELECT doc_id FROM document WHERE "'.$cond.'") ';
   }
    //check arry
if  (count($cond) > 0) // case have some 
    {  $conds = join(" and ",$cond); } 
if  (count($cond) == 1) // case have one 
    {  $conds = " where ".$cond[0]; } 
else // case cond == 0
	{  $conds ="";}
$sql = $sql='select * ,type_name from document left join doctype on document.doc_type = doctype.type_id'.$conds;
}
	if(!empty($sql)){
	$dbquery=mysql_query($sql);
	$num_rows=mysql_num_rows($dbquery);
	$_SESSION['sqlm']=$sql;
	echo $conds;
	echo $sql;
	}
?>