点餐外卖系统开发是一个过程，在这个过程中，人们只需坐在家里或任何地方，就可以通过互联网从当地的一些餐馆和酒店订购各种食品和饮料。并将订单交付到指定的位置。
PHP中的点餐外卖系统是一个使用 PHP、JavaScript 和 CSS 开发的简单源码项目。该项目将不同的餐厅与顾客联系起来。该项目包含一个管理员（经理）和用户端。编辑网站内容、更新食品、添加餐厅和检查订单状态等所有管理都可以从管理员端进行管理。站点上可以有许多管理员。
演示：c.ymzan.top
技术概述：
前端：HTML、CSS、JavaScript
HTML：HTML 用于创建和保存 Web 文档。例如记事本/记事本++
CSS：（层叠样式表）创建有吸引力的布局
Bootstrap：响应式设计的移动友好网站
JavaScript：它是一种编程语言，通常与网络浏览器一起使用。
后端：PHP、MySQL
PHP：超文本预处理器 (PHP) 是一种技术，允许软件开发人员根据客户请求以 HTML、XML 或其他文档类型创建动态生成的网页。PHP 是开源软件。
MySQL：MySql 是一种数据库，广泛用于访问、更新和管理数据库中的数据。
软件需求（任意一项）
WAMP 服务器
XAMPP 服务器
MAMP 服务器
ring.go
package
ring
import (
"errors"
"runtime"
"sync/atomic"
"time"
)
var (
// ErrDisposed is returned when anoperation is performed on a disposed
// queue.
ErrDisposed = errors.New(`queue:disposed`)
// ErrTimeout is returned when anapplicable queue operation times out.
ErrTimeout = errors.New(`queue: poll timedout`)
// ErrEmptyQueue is returned when annon-applicable queue operation was called
// due to the queue's empty item state
ErrEmptyQueue = errors.New(`queue: emptyqueue`)
)
// roundUp
takes a uint64 greater than 0 and rounds it up to the next
// power
of 2.
func
roundUp(v uint64) uint64 {
v--
v |= v >> 1
v |= v >> 2
v |= v >> 4
v |= v >> 8
v |= v >> 16
v |= v >> 32
v++
return v
}
type node
struct {
position uint64
data interface{}
}
type nodes
[]node
//
RingBuffer is a MPMC buffer that achieves threadsafety with CAS operations
// only. A put on full or get on empty call will blockuntil an item
// is putor retrieved. Calling Dispose on theRingBuffer will unblock
// anyblocked threads with an error. Thisbuffer is similar to the buffer
//
described here: http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue
// with
some minor additions.
type
RingBuffer struct {
_padding0 [8]uint64
queue uint64
_padding1 [8]uint64
dequeue uint64
_padding2 [8]uint64
mask, disposed uint64
_padding3 [8]uint64
nodes nodes
}
func (rb
*RingBuffer) init(size uint64) {
size = roundUp(size)
rb.nodes = make(nodes, size)
for i := uint64(0); i < size; i++ {
rb.nodes[i] = node{position: i}
}
rb.mask = size - 1 // so we don't have todo this with every put/get operation
}
// Putadds the provided item to the queue. Ifthe queue is full, this
// call
will block until an item is added to the queue or Dispose is called
// on thequeue. An error will be returned if thequeue is disposed.
func (rb
*RingBuffer) Put(item interface{}) error {
_, err := rb.put(item, false)
return err
}
// Offeradds the provided item to the queue if there is space. If the queue
// isfull, this call will return false. Anerror will be returned if the
// queue
is disposed.
func (rb
*RingBuffer) Offer(item interface{}) (bool, error) {
return rb.put(item, true)
}
func (rb
*RingBuffer) put(item interface{}, offer bool) (bool, error) {
var n *node
pos := atomic.LoadUint64(&rb.queue)
L:
for {
if atomic.LoadUint64(&rb.disposed)== 1 {
return false, ErrDisposed
}
n = &rb.nodes[pos&rb.mask]
seq :=atomic.LoadUint64(&n.position)
switch dif := seq - pos; {
case dif == 0:
ifatomic.CompareAndSwapUint64(&rb.queue, pos, pos+1) {
break L
}
case dif < 0:
panic(`Ring buffer in acompromised state during a put operation.`)
default:
pos =atomic.LoadUint64(&rb.queue)
}
if offer {
return false, nil
}
runtime.Gosched() // free up thecpu before the next iteration
}
n.data = item
atomic.StoreUint64(&n.position, pos+1)
return true, nil
}
// Getwill return the next item in the queue. This call will block
// if thequeue is empty. This call will unblockwhen an item is added
// to thequeue or Dispose is called on the queue. An error will be returned
// if the
queue is disposed.
func (rb
*RingBuffer) Get() (interface{}, error) {
return rb.Poll(0)
}
// Pollwill return the next item in the queue. This call will block
// if thequeue is empty. This call will unblock whenan item is added
// to the
queue, Dispose is called on the queue, or the timeout is reached. An
// error
will be returned if the queue is disposed or a timeout occurs. A
//
non-positive timeout will block indefinitely.
func (rb
*RingBuffer) Poll(timeout time.Duration) (interface{}, error) {
var (
n *node
pos = atomic.LoadUint64(&rb.dequeue)
start time.Time
)
if timeout > 0 {
start = time.Now()
}
L:
for {
ifatomic.LoadUint64(&rb.disposed) == 1 {
return nil, ErrDisposed
}
n = &rb.nodes[pos&rb.mask]
seq :=atomic.LoadUint64(&n.position)
switch dif := seq - (pos + 1); {
case dif == 0:
ifatomic.CompareAndSwapUint64(&rb.dequeue, pos, pos+1) {
break L
}
case dif < 0:
panic(`Ring buffer incompromised state during a get operation.`)
default:
pos =atomic.LoadUint64(&rb.dequeue)
}
if timeout > 0 &&time.Since(start) >= timeout {
return nil, ErrTimeout
}
if timeout < 0 {
return nil, ErrTimeout
}
runtime.Gosched() // free up thecpu before the next iteration
}
data := n.data
n.data = nil
atomic.StoreUint64(&n.position,pos+rb.mask+1)
return data, nil
}
// Len
returns the number of items in the queue.
func (rb
*RingBuffer) Len() uint64 {
return atomic.LoadUint64(&rb.queue) -atomic.LoadUint64(&rb.dequeue)
}
// Cap
returns the capacity of this ring buffer.
func (rb
*RingBuffer) Cap() uint64 {
return uint64(len(rb.nodes))
}
// Dispose
will dispose of this queue and free any blocked threads
// in thePut and/or Get methods. Calling thosemethods on a disposed
// queue
will return an error.
func (rb
*RingBuffer) Dispose() {
atomic.CompareAndSwapUint64(&rb.disposed,0, 1)
}
//
IsDisposed will return a bool indicating if this queue has been
//
disposed.
func (rb
*RingBuffer) IsDisposed() bool {
return atomic.LoadUint64(&rb.disposed)== 1
}
//
NewRingBuffer will allocate, initialize, and return a ring buffer
// with
the specified size.
func
NewRingBuffer(size uint64) *RingBuffer {
rb := &RingBuffer{}
rb.init(size)
return rb
}
安装步骤
1. 在您的本地服务器上下载 zip 文件和解压缩文件。
2. 将此文件放入 "c:/wamp/www/" 中。
3. 数据库配置
打开 phpmyadmin
创建名为 food的数据库。
从下载的文件夹（数据库内）导入数据库food.sql
4. 打开您的浏览器放入“ http://localhost/Online Food ordering system/”
管理员登录详情
登录 ID：root
密码：toor
该系统的特点如下：
- 在线订购产品
- 在线上传产品设计
- 添加、编辑、删除产品
- 通过电子邮件发送订单确认
- 管理在线订单
- 用于支付方式的 Ajax 分层组合框。
- 在覆盖区域之外添加运费
- 安全预订
- 客户对网站发表评论的论坛
- 生成各种报告
- 等等
对于用户部分，用户可以浏览主页、关于和联系页面。为了订购食物，用户必须创建一个帐户并登录或登录。食物也需要付费。该项目为客户在线购买/购买食物提供了一种便捷的方式，而无需去餐厅。
这个点餐外卖系统采用 PHP、JavaScript 和 CSS 编写。谈到这个系统的功能，它包含管理员（经理）部分和用户（客户）部分。所有的编辑、更新、管理订单详细信息、食品和餐厅都来自管理部分，而客户只能通过该网站并在需要时下订单。该系统的设计和开发很简单，因此用户在使用它时不会遇到任何困难。