How to close connection of PHP ???

Hi all,
I always see that every large code has not a closed connection, is it mean when I have a small code I will close and when I have a large code I will not close the connection ?
here is one of my codes, so how to close, because my connection is in a file called connection.php .

 
  <?php 
       include("../connection.php");
       $DeptID =htmlentities(mysql_real_escape_string($_POST[Dept_ID]));
       $query = "SELECT * from departement where deptID= '$OpID'     "   ;		
       $result  = mysql_query($query) ;
  ?>
<table width="655" border="0" align="center" cellpadding="0" cellspacing="0">
   <tr>
    <td><strong>Dept ID </strong></td>
    <td><strong>Dept Name  </strong></td>
    <td><strong>Location  </strong></td>
  </tr>
<?php    while($rows= mysql_fetch_array($result)) { ?>
    <tr>
    <td>  <?php echo  $rows[0] ;?>&nbsp;</td>
    <td>  <?php echo  $rows[1] ;?>&nbsp;</td>
    <td>  <?php echo  $rows[2] ;?>&nbsp;</td>
  </tr>
<?php } ?>
</table>
 

Code (markup):

I ask this Question because I sometimes see in my web page Error of connection " To many connection ". I dont know the cause ? so plz help me , thank u 4 ur Time.

 

Hi!

Use This In The End!

<?php mysql_close(); ?>

 

Thanks HungryMinds
Is that means use mysql_close() at every peace of code ?

 

Anytime My Friend...
Yes...
If U'll Not Close Your Connection...
Some One Genius Can Hack Your CODE Easily
So Close Your Connection When U Feel That Your PHP Work Has Been DONE On The Page.

 

As far as i know, mysql automatically closes connection on the end of your script although you do not put "mysql_close()" on your script, except your script use persistent connection (mysql_pconnect)

Assuming your script does not use persistent connection, it means your server (actually the mysql) is not powerful enough to handle too many visitors.

 

Thank u all my friends.