php mysql ช่วยดูให้หนน่อยครับว่าลบได้แต่ทำไม insertไม่ได้อ่าครับ

<?
session_start();
	if (session_is_registered("valid_uname") && session_is_registered("valid_pwd")) {
}else{
header('location:home.php');
exit();
}
require_once('connect/connect.php');
?>
<?	 
function DateDiff($strDate1,$strDate2) 
  
{ 
                
return (strtotime($strDate2) - strtotime($strDate1))/  ( 60 * 60 * 24 );  // 1 day = 60*60*24 
    
} 

$sql3="select * from orders where pay_status='0' ";
	$result3=mysql_db_query($db,$sql3);
	while($c=mysql_fetch_array($result3))
	{ $date0=('$c[or_date]');
$now=time();
	 	$diff = ( strtotime($now) - strtotime($date0) ) / ( 60 * 60 * 24 );

		if (DateDiff("$c[or_date]" ,"".date("Y-m-d")) >=3 )
		{ 
				$sql7="select * from orders where or_id ='$c[or_id]'  ";
	$result7=mysql_db_query($db,$sql7);
	while($b=mysql_fetch_array($result7))
	        { 
			
				$sql4="insert into blacklist (or_id , or_date , c_i d, c_fulname , c_adress , or_sum , pay_status ,  delive_status) values ('$b[or_id]','$b[or_date]','$b[c_id]','$b[c_fulname]','$b[c_adress]','$b[or_sum]','$b[pay_status]','$b[delive_status]')";
				$query4=mysql_db_query($db,$sql4);
			 }
			$sql5="delete from orders where or_id='$c[or_id]' " ;
			$query5=mysql_db_query($db,$sql5);
		}
	} 
		echo "<meta http-equiv='refresh' content='0;url=pay.php' />";
?>