How do I unset session products in shopping cart using remove button?

Question

How do I unset session products in a shopping cart using a remove button? I have the below code; 'clear cart' is working and unsets the session for all items from the shopping. But the problem is that 'remove' doesn't unset single products through pid?

Php :

session_start();

$pid=$_SESSION['pid'];

function remove_product($pid){
  $pid=intval($pid);
  $max=count($_SESSION['product1']);

  for($i=0;$i<$max;$i++){

    if($pid==$_SESSION['product1'][$i]['pid']){
      unset($_SESSION['product1'][$i]);
      break;
    }

  }

  $_SESSION['product1']=array_values($_SESSION['product1']);

}

if($_REQUEST['command']=='delete' && $_REQUEST['pid']>0){
  remove_product($_REQUEST['product1'][$pid]);
}

if($_REQUEST['command']=='clear' && isset($_REQUEST['remove'])){
  unset($_SESSION['image12']);
  unset($_SESSION['product1']);
  unset($_SESSION['price12']);
  unset($_SESSION['itemcode3']);
  unset($_SESSION['sizes12']);
}   

Js :

function del(pid){

  if(confirm('Do you really mean to delete this item')){
    document.form1.pid.value=pid;
    document.form1.command.value='delete';
    document.form1.submit();
  }

}

function clear_cart(){

  if(confirm('This will empty your shopping cart, continue?')){
    document.form1.command.value='clear';
    document.form1.submit();
  }

}

Html:

<form  name="form1" method="post">  

  <input type="hidden" name="pid" />
  <input type="hidden" name="command" />  

  <input type="button" class="button2" value="Clear Cart" onclick="clear_cart()" />

  <a href="javascript:del(<?php echo $pid?>)">
    <input type="button" class="button2" value="Remove" />
  </a>

</form>

Answer 1

if($_REQUEST['command']=='delete' && $_REQUEST['pid']>0){
remove_product($_REQUEST['product1'][$pid]);
}

is no $_REQUEST['product1'] in your form, maybe

if($_REQUEST['command']=='delete' && $_REQUEST['pid']>0){
remove_product($_REQUEST['pid']);
}

$_REQUEST['remove'] also

Answer 2

if($_REQUEST['command']=='clear' && isset($_REQUEST['remove'])){
unset($_SESSION['image12']);
unset($_SESSION['product1']);
unset($_SESSION['price12']);
unset($_SESSION['itemcode3']);
unset($_SESSION['sizes12']);
}   

I don't see any $_REQUEST['remove'] to be sent.

Your clear command also don't send $pid, isn't it necessary?

In fact, clear() sends query string pid=&command=clear