Implode&Explode in Array

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array.php:

<form name="aform" method="post">
<table border="0px" cellpadding="10" cellspacing="0" id="tbl">
<tr><td align="center" colspan="2">Driving Form</td></tr>
<tr>
     <td>vehicle</td>
     <td>
     <select name="mul[]" multiple style="width:150px;" size="10">
     <option value="Rohini">Rohini</option>
     <option value="Rogini">Rogini</option>
     <option value="Rokini">Rokini</option>
     <option value="rubini">rubini</option> <option value="Rohini">Rohini

     </option>
     <option value="Rogini">Rogini</option>
     <option value="Rokini">Rokini</option>
     <option value="rubini">rubini</option>
      <option value="Rohini">Rohini</option>
     <option value="Rogini">Rogini</option>
     <option value="Rokini">Rokini</option>
     <option value="rubini">rubini</option>
      <option value="Rohini">Rohini</option>
     <option value="Rogini">Rogini</option>
     <option value="Rokini">Rokini</option>
     <option value="rubini">rubini</option>
     </select>
     </td></tr>
<tr>

<td colspan="2" align="center"><input type="submit" name="submit" 

value="submit" /></td></tr>

</table>
</form>

Implode.php:

<?php
$conn=mysql_connect("localhost","root","");
$select_db=mysql_select_db("each_db",$conn);

if(isset($_POST['submit']))
{
    
$val=implode(',',$_POST['mul']);

$insert=mysql_query("insert into a(val) values('$val')");

}
?>

Explode.php:

<?php

$conn=mysql_connect("localhost","root","");
$select_db=mysql_select_db("each_db",$conn);

if(isset($_POST['submit']))
{

$val=implode(',',$_POST['mul']);
$insert=mysql_query("insert into a(val) values('$val')");
$select_tbl=mysql_query("select * from a",$conn);
while($fetch=mysql_fetch_object($select_tbl))
{
    $r=$fetch->val;
        $i=explode(",",$r);
    
}}

Script:

<script type="text/javascript">
function validation()
{
    var name=document.aform.vehicle.value;
    if(name=="" || name=="null")
    {
        alert("mark ur value");
        document.aform.vehicle.focus();
        return false;
    }
    
}
</script>