如何从循环中的单个复选框发送多个值

Hi I'm pretty new to PHP I need help with this small form I've made on my page.

I have a single checkbox which is in a loop. I seem to get only a single checkbox value passed. Here's my form and php code:

Form:

<?php if($show_captions) { 
     $pic_path=$album."/".$caption;
?>
     <div class="caption" align="center">
     <form name="store" id="str" action="store.php" method="get">
     <input type="checkbox" name="pic[]" value="<?php echo $pic_path ?>"/>
     </form>
     </div>

<?php } ?>

store.php:

<?php
$path=$_GET['pic'];
if(isset($_GET['pic']))
{
    foreach($path as $pic){
    echo $pic;
}
}

?>