gio hang cua thang sang

phantich_giohang.php

<?php 

// index.php?module=themgiohang&masanpham=1

// quy luat
$_SESSION['giohang'] = [
	['masanpham' => 1, 'soluong' => 5], 
	['masanpham' => 2, 'soluong' => 1], 
	['masanpham' => 5, 'soluong' => 2], 
	['masanpham' => 100, 'soluong' => 1], 
];

// themgiohang.php
$_SESSION['giohang'][] = ['masanpham' => 1, 'soluong' => 5];

// xoagiohang.php 
unset($_SESSION['giohang']);

// xoasanphamcuagiohang.php &masanpham=5
foreach ($_SESSION['giohang'] as &$giohang) {
	if ($_GET['masanpham'] == $giohang['masanpham']) {
		unset($giohang);
	}
}

// capnhatgiohang.php &masanpham=5 &soluong=68
foreach ($_SESSION['giohang']  as &$giohang) {
	if ($_GET['masanpham'] == $giohang['masanpham']) {
		$giohang['soluong'] = $_GET['soluong'];
	}
}

// xemgiohang.php
foreach ($_SESSION['giohang']  as $giohang) {
	$sanpham = get_sanpham_theo_masanpham($giohang['masanpham']);
	// in san pham theo yeu cau
}