arrays - Increment SESSION amount PHP -


i'm using sessions populate simple shopping cart but, i'm having problems getting itemamount increment if item_id exists within session['cart'].

i have been trying increment here: $itemamount = $eachitem['itemamount']; but, can't working.

this have @ moment;

updated; code better naming, still need getting cart_item_amount increment, @ moment creates new item every time instead of incrementing cart_item_amount.

<?php if (!isset($_session)) {   session_start(); } // create cart session if(!isset($_session['cart'])) {     $_session['cart'] = array(); } ?> <?php // if posts fine if(isset($_post['item_id'])) {      // set post values     $post_item_id = $_post['item_id'];     $post_item_name = $_post['item_name'];     $post_options = $_post['item_options'];     $post_item_extras = $_post['item_extras'];      // set initial item amount     $item_total = 1;      foreach($_session['cart'] $key => $value) {          if($value['cart_item_id'] == $post_item_id) {              $value['cart_item_amount']++;             $item_total = $value['cart_item_amount'];          }else{          }     }     // if option selected     if(isset($post_options)) {          // split 2 separate values         list($post_item_cost, $post_option_name) = explode("-", $post_options, 2);      }      // loop through extras               if(isset($post_item_extras)) {          foreach($post_item_extras $key => $value) {              // split 2 separate values             list($post_extra_cost, $post_extra_name) = explode("-", $value, 2);              // create extras array             $item_extras[] = array(                 'cart_extra_cost' => $post_extra_cost,                 'cart_extra_name' => $post_extra_name             );          }     }      // add each item array     $cart_row = array(         'cart_item_id' => $post_item_id,         'cart_item_name' => $post_item_name,         'cart_option_name' => $post_option_name,         'cart_item_cost' => $post_item_cost,         'cart_item_amount' => $item_total,         // add extras array         'cart_item_extras' => $item_extras      );          // add new row session cart         $_session['cart'][] = $cart_row; } ?>  array (     [cart] => array         (             [0] => array                 (                     [cart_item_id] => 76                     [cart_item_name] => cheese burger                     [cart_option_name] => small                     [cart_item_cost] => 1.00                     [cart_item_amount] => 1                     [cart_item_extras] =>                  )              [1] => array                 (                     [cart_item_id] => 76                     [cart_item_name] => cheese burger                     [cart_option_name] => small                     [cart_item_cost] => 1.00                     [cart_item_amount] => 2                     [cart_item_extras] =>                  )              [2] => array                 (                     [cart_item_id] => 76                     [cart_item_name] => cheese burger                     [cart_option_name] => small                     [cart_item_cost] => 1.00                     [cart_item_amount] => 3                     [cart_item_extras] =>                  )          )  ) 

if($eachitem['itemid'] = $_post['item_id']) {

= not comparison operator, see http://php.net/manual/en/language.operators.comparison.php

should 

if($eachitem['itemid'] == $_post['item_id']) {

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