สอบถามเรื่อง Counter PHP ทำไมถึงบันทึกข้อมูลลงในตารางไม่ได้คะ

<?php 
include("connect/connect_db.php"); 
$date  =date("d-m-Y"); 
$ip = $_SERVER['REMOTE_ADDR']; 
$sql="INSERT INTO counter(date_visit,ip_visit,visit)VALUES 
('$date', '$ip', '1')"; 
mysql_query($sql); 
 
  
/*----------------------OPEN PAGE----------------------*/
$today = date('d-m-Y'); 
$sql="Select count(ip_visit) as visit From counter" ; 
$result= mysql_query($sql); 
$row = mysql_fetch_array($result); 
$visit = $row[visit]; 
$id_visit = $row[id_vist]; 
$openpage =  str_pad($visit,6,0,str_pad_left); 

  
/*----------------------TODAY BY IP----------------------*/
$today = date('d-m-Y'); 
$sql="Select count(DISTINCT(ip_visit)) as visit From counter 
where date_visit = '$today'" ; 
$result= mysql_query($sql); 
$row = mysql_fetch_array($result); 
$visit = $row[visit]; 
$id_visit = $row[id_vist]; 
$today = str_pad($visit,6,0,str_pad_left); 
  
/*----------------------TOTAL IP-----------------------*/
$sql="Select count(DISTINCT(ip_visit)) as visit From counter"; 
$result= mysql_query($sql); 
$row = mysql_fetch_array($result); 
$visit = $row[visit]; 
$total = str_pad($visit,6,0,str_pad_left); 

?> 
<center> 
<table> 
     
<tr><td>Open Page : </td><td id="counter"bgcolor="#0252A1"> 
<?=$openpage?></td></tr> 
  
<tr><td>Today : </td><td id="counter"bgcolor="#1BAFD5"> 
<?=$today?></td></tr> 
 
<tr><td>Total : </td><td id="counter"bgcolor="#D96003"> 
<?=$total?></td></tr> 

</table> 
</center>