PHP更新MySQL数据库的问题

I'm having issues with the form below, whenever i click on an item it catches the item and updates on the mySQL table, it only displays 1 item(how do i make it display all the items that i have checked?).

Also when i put in a quantity in it doesn't update on the mySQL table and it just says 0 when i've put multiple quantities of each item.

Are you guys able to help if that's ok?

<tr>
<th>Shirts</th>
<th>Quantity</th>
</tr>

<tr>

<td>
        <br />
        <input type="checkbox" name="items" value="SH01" /><label for="rd1">Obey T-Shirt: $9.99</label></div> <br />
        <input type="checkbox" name="items" value="SH02" /><label for="rd1">Obey Professor: $9.99</label></div> <br />
        <input type="checkbox" name="items" value="SH03" /><label for="rd1">Hustle T-Shirt: $9.99</label></div> <br />
        <input type="checkbox" name="items" value="SH04" /><label for="rd1">Hip-Hop Support: $9.99</label></div> <br />
        <input type="checkbox" name="items" value="SH05" /><label for="rd1">90's Shirt: $9.99</label></div> <br />
        <input type="checkbox" name="items" value="SH06" /><label for="rd1">DOPE Shirt: $9.99</label></div> <br />
        <br />
</td>

<td> 
        <br />
        <input type="text" name="qty" size ="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <br />

</td>

</tr>

<tr>

    <td>
        <br />
        <input type="checkbox" name="items" value="SO1" /><label for="rd1">Shoe - Red Lace: $19.99</label></div><br />
        <input type="checkbox" name="items" value="SO2" /><label for="rd1">Shoe - Red High Top: $19.99</label></div><br />
        <input type="checkbox" name="items" value="SO3" /><label for="rd1">Shoe - White: $19.99</label></div><br />
        <input type="checkbox" name="items" value="SO4" /><label for="rd1">Shoe - Black: $19.99</label></div><br />
        <input type="checkbox" name="items" value="SO5" /><label for="rd1">Shoe - Black High Top: $19.99</label></div><br /> 
        <input type="checkbox" name="items" value="SO6" /> <label for="rd1">Red Basketball: $19.99</label></div><br />
        <br />
    </td>

    <td> 
        <br />
        <input type="text" name="qty[]" size ="2"/><br/>
        <input type="text" name="qty[]" size="2"/><br/>
        <input type="text" name="qty[]" size="2"/><br/>
        <input type="text" name="qty[]" size="2"/><br/>
        <input type="text" name="qty[]" size="2"/><br/>
        <input type="text" name="qty[]" size="2"/><br/>
        <br />

</td>
</tr>

<tr>
    <td>
        <br />
        <input type="checkbox" name="items" value="SN1" /> <label for="rd1">Snapback Bullets: $29.99</label></div><br />
        <input type="checkbox" name="items" value="SN2" /><label for="rd1">Snapback: $29.99</label></div><br />
        <input type="checkbox" name="items" value="SN3" /><label for="rd1">Snapback Bullets: $29.99</label></div><br />
        <input type="checkbox" name="items" value="SN4" /><label for="rd1">Snapback Bullets: $29.99</label></div><br />
        <input type="checkbox" name="items" value="SN5" /><label for="rd1">Snapback Bullets: $29.99</label></div><br />
        <input type="checkbox" name="items" value="SN6" /><label for="rd1">Snapback Bullets: $29.99</label></div><br />
        <br />
    </td>
<td> 
        <br />
        <input type="text" name="qty" size ="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <input type="text" name="qty" size="2"/><br/>
        <br />

</td>   
</tr>

</tr>
</table>
<br />
<input type="submit" name="submit">
</form>

<?php

if (isset($_POST['submit']))
{
$con = mysql_connect('$localhost','$url','$pass');
if (!$con)
{
die("Could Not Connect: " . mysql_error());
}

mysql_select_db("$username",$con);

$sql = "INSERT INTO Order_Information(Order_ID,Order_Items,Order_Quantity) VALUES (null,'$_POST[items]','$_POST[qty]')";

mysql_query($sql,$con);

mysql_close($con);
}

?>

1. When using the $_POST[items], you forgot about the apostrophes - $_POST['items'].

2. To get all checked checkboxes, you need a loop:

   if(!empty($_POST['check_list']))
   {
       foreach($_POST['items'] as $item)
       {
           ....
       }
   }
   

The first thing you need to do is update in a foreach loop so that you are inserting one row for each checked item and secondly you need to relate the quantity fields to those items by using an array.

Change your Quantity field names to an array including the code for the items:

<input type="text" name="qty['SO1']" size ="2"/><br/>
        <input type="text" name="qty['SO2']" size="2"/><br/>
etc ...

Then in your PHP:

foreach ($_POST['items'] as $item) {
  foreach($_POST['qty'] as $key => $value) {
    $quantity = 0;
    if ($key == $item) {
      $quantity = $value;
    }
  }
$sql = "INSERT INTO Order_Information(Order_Items,Order_Quantity) VALUES ('$item', '$quantity')";
.
.
}

HTML

<input type="checkbox" name="items" value="SH01" />
<input type="text" name="qty_SH01" ..../>

PHP

foreach ($_POST as $key => $val) {
   if (!preg_match("/^SH/", $key)) continue;

   $qty = $_POST['qty_' . $key];

   $sql = "INSERT INTO Order_Information(Order_Items,Order_Quantity) VALUES ('$key', '$qty')";
}