PHP multiple checkbox array with different values - Get total price of checked checkboxes

HTML Code

0<input type="checkbox" name="count[]" id="count[]" value="0"/>
<input type="hidden" name="language[]" id="language" value="C++"/>C++ 
<input type="hidden" name="price[]" id="price" value="700"> <br/>

1<input type="checkbox" name="count[]" id="count[]" value="1"/>
<input type="hidden" name="language[]" id="language" value="Assembler"/>Assembler 
<input type="hidden" name="price[]" id="price" value="600"><br/>

2<input type="checkbox" name="count[]" id="count[]" value="2"/>
<input type="hidden" name="language[]" id="language" value="Java"/>Java 
<input type="hidden" name="price[]" id="price" value="500"> <br/>

3<input type="checkbox" name="count[]" id="count[]" value="3"/>
<input type="hidden" name="language[]" id="language" value="PHP"/>PHP 
<input type="hidden" name="price[]" id="price" value="400"> <br/>

4<input type="checkbox" name="count[]" id="count[]" value="4"/>
<input type="hidden" name="language[]" id="language" value="PHP"/>PHP 
<input type="hidden" name="price[]" id="price" value="400"> <br/>

<input type="submit" name="sbt" id="sbt" value="SUBMIT"> 

This is PHP

<?php

if(isset($_POST['sbt'])){ <br/>
  $count = $_POST['count']; <br/>
  $sub_menu = $_POST['sub_menu']; <br/>
  $sub_price = $_POST['sub_price']; <br/>

foreach($count as $j)

   echo $sub_menu[$j] . '['.$sub_price[$j]. ']' ;<br/>
}<br/>
?>

How to calculate the sum - total price of checked checkboxes?

for example : result should be displayed like:

Total Price of Selected Programming Languages : C++,Java = 1200$