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概述PHP session如何实现购物车功能

在wamp环境下，用PHP的session会话控制完成购物车的效果，数据存放在数组里练习，没有连接数据库，效果不错，简单易懂,以下是各部分的代码

common.PHP

<?PHPheader("content-type:text/HTML;charset=utf-8");$arrPro = array(    array('ID'=>1,'img'=>'img/1.jpg','Title'=>'小米移动电源5000mAh','price'=>49),    array('ID'=>2,'img'=>'img/2.jpg','Title'=>'20000mAh小米移动电源2','price'=>149),    array('ID'=>3,'img'=>'img/3.jpg','Title'=>'小米圈铁耳机Pro','price'=>129),    array('ID'=>4,'img'=>'img/4.jpg','Title'=>'小米家电动滑板车','price'=>1999),    array('ID'=>5,'img'=>'img/5.jpg','Title'=>'小米笔记本','price'=>3499),    array('ID'=>6,'img'=>'img/6.jpg','Title'=>'米家LED智能台灯','price'=>169),    array('ID'=>7,'img'=>'img/7.jpg','Title'=>'小米体重秤','price'=>99),    array('ID'=>8,'img'=>'img/8.png','Title'=>'小米电视3s 48英寸','price'=>2599)  );

index.PHP

<?PHP header("content-type:text/HTML;charset=utf-8");require 'common.PHP';session_start();$sum = 0;$class = "";//判断左上角购物车的样式显示if(!empty($_SESSION['shopcar'])){  $data = $_SESSION['shopcar'];  $sum = array_sum($data[4]);  $class = "on";  //右上角圆点    if(empty($data[0])){      $class = "";    }  }?><!DOCTYPE HTML><HTML lang="en"><head>  <Meta charset="UTF-8">  <Title>商品展示</Title>  <style type="text/CSS">  section{    wIDth:1032px;    height: 700px;    margin: 40px auto;  }  .top{    float: right;    position: relative;    wIDth: 190px;    height: 34px;    border: 1px solID #ccc;    margin-right: 32px;    text-align: center;    line-height: 34px;    border-radius: 4px;    Transition: all .3s linear;    -moz-Transition: all .3s linear;    -webkit-Transition: all .3s linear;  }  .top a{    color: #d00;  }  .top:hover{    wIDth: 210px;    color: #fff;    Font-weight: bold;    background-color: #d00;    border-radius: 6px;  }  .top:hover a{    color: #fff;  }  .top:hover span{    background-color: #fff;    color: #d00;  }  .top:hover .star{    right:150px;    top: 0;    Font-size: 14px;    color: #ff0;    transform: rotate(1080deg);  }  .top span{    position: absolute;    top:2px;    right: 40px;    wIDth: 18px;    height: 18px;    Font-weight: bold;    border-radius: 9px;    line-height: 18px;    text-align: center;    Font-size: 12px;    Font-weight: border;    color: #fff;  }  .star{    color: #fff;    Font-size: 48px;    Font-style: normal;    position: absolute;    right:530px;    top:186px;    transform: rotate(60deg);    Transition: all .3s ease;  }  .on{    background-color: #e00;  }  .List{    margin: 20px 20px;    padding: 36px 0;    List-style: none;  }    a{    display: block;    color: #757575;    text-decoration: none;  }  .List li{    float: left;    height: 246px;    wIDth: 234px;    padding: 10px 0 20px;    margin-right:12px;    margin-top: 20px;    border: 1px solID #ccc;    background: #fff;    -webkit-Transition: all .2s linear;    Transition: all .2s linear;  }  .List li:hover{    Box-shadow: 2px 4px 5px #aaa;  }  .figure{    wIDth: 150px;    height: 150px;    margin: 0 auto 18px;  }  .Title{    color: #222;    Font-size: 14px;    Font-weight: normal;    text-align: center;  }  .price{    margin: 0 10px 10px;    text-align: center;    color: #ff6700;  }  .cart{    margin: 0 15px 5px;    text-align: center;  }  .cart a{    color: #a34;    wIDth: 190px;    height: 24px;    border-radius: 4px;    margin: 0 8px 5px;    text-align: center;  }  .cart a:hover{    color: #eee;    Box-shadow: 0 2px 1px #333,0 2px 1px #666;    background-color: #ccc;    background-image: linear-gradIEnt(#33a6b8,#0089a7)  }  .num{    text-align: center;    color: #ff6700;  }  </style></head><body>  <section>  <p class='top'>  <a href="spcar.PHP" rel="external nofollow" >我的购物车</a><span class="<?PHP echo $class;?>"><?PHP echo $sum;?></span>  <em class='star'>★</em>  </p>  <ul class="List">  <?PHP foreach ($arrPro as $key => $value):?>  <li>    <p class="figure">     <a href=""><img src=" rel="external nofollow" <?PHP echo $value['img'];?>" wIDth="150" height="150" alt="小米移动电源5000mAh"></a>     </p>     <h3 class="Title">     <a href=""><?PHP echo $value['Title'];?></a>    </h3>     <p class="price"><span class="num">￥<?PHP echo $value['price'];?></span></p>    <p class='cart'><a href="action.PHP?ID=<?PHP echo $value['ID'];?>" rel="external nofollow" >加入购物车</a></p>  </li>  <?PHP endforeach;?>  </ul>  <p style='clear:both'></p>  </section></body></HTML>

action.PHP

<?PHPif(!empty($_GET['ID'])){  require 'common.PHP';  session_start();  $ID = $_GET['ID'];  //把所选ID的商品信息遍历出来  foreach ($arrPro as $key => $value) {    if($ID == $value['ID']){    $arrData = $arrPro[$key];    }  }  //用一个新的二维数组把商品信息存起来  $arrdatax[0][$arrData['ID']] = $arrData['ID'];  $arrdatax[1][$arrData['ID']] = $arrData['img'];  $arrdatax[2][$arrData['ID']] = $arrData['Title'];  $arrdatax[3][$arrData['ID']] = $arrData['price'];  $arrdatax[4][$arrData['ID']] = 1;  //判断是否有SESSION存在，有则在数组后添加，没有则直接存  if(empty($_SESSION['shopcar'])){    $_SESSION['shopcar'] = $arrdatax;    header('Location:index.PHP');  }else{    //第一次购物之后的购物    //重新取出来，防止数据覆盖    $arrDataz = $_SESSION['shopcar'];    if(in_array($ID,$arrDataz[0])){      $arrDataz[4][$arrData['ID']] += 1;      $_SESSION['shopcar'] = $arrDataz;      header('Location:index.PHP');    }else{      $arrDataz[0][$arrData['ID']] = $arrData['ID'];      $arrDataz[1][$arrData['ID']] = $arrData['img'];      $arrDataz[2][$arrData['ID']] = $arrData['Title'];      $arrDataz[3][$arrData['ID']] = $arrData['price'];      $arrDataz[4][$arrData['ID']] = 1;      $_SESSION['shopcar'] = $arrDataz;      header('Location:index.PHP');    }  }}else{  echo "购物车没有商品!";}

spcar.PHP

<?PHPif(!empty($_GET['ID'])){  require 'common.PHP';  session_start();  $ID = $_GET['ID'];  //把所选ID的商品信息遍历出来  foreach ($arrPro as $key => $value) {    if($ID == $value['ID']){    $arrData = $arrPro[$key];    }  }  //用一个新的二维数组把商品信息存起来  $arrdatax[0][$arrData['ID']] = $arrData['ID'];  $arrdatax[1][$arrData['ID']] = $arrData['img'];  $arrdatax[2][$arrData['ID']] = $arrData['Title'];  $arrdatax[3][$arrData['ID']] = $arrData['price'];  $arrdatax[4][$arrData['ID']] = 1;  //判断是否有SESSION存在，有则在数组后添加，没有则直接存  if(empty($_SESSION['shopcar'])){    $_SESSION['shopcar'] = $arrdatax;    header('Location:index.PHP');  }else{    //第一次购物之后的购物    //重新取出来，防止数据覆盖    $arrDataz = $_SESSION['shopcar'];    if(in_array($ID,$arrDataz[0])){      $arrDataz[4][$arrData['ID']] += 1;      $_SESSION['shopcar'] = $arrDataz;      header('Location:index.PHP');    }else{      $arrDataz[0][$arrData['ID']] = $arrData['ID'];      $arrDataz[1][$arrData['ID']] = $arrData['img'];      $arrDataz[2][$arrData['ID']] = $arrData['Title'];      $arrDataz[3][$arrData['ID']] = $arrData['price'];      $arrDataz[4][$arrData['ID']] = 1;      $_SESSION['shopcar'] = $arrDataz;      header('Location:index.PHP');    }  }}else{  echo "购物车没有商品!";}

delete.PHP

<?PHPsession_start();if(!empty($_GET['ID'])){  $arrData = $_SESSION['shopcar'];  //判断对应的商品ID信息    if(in_array($_GET['ID'],$arrData[0])){      unset($arrData[0][$_GET['ID']]);      unset($arrData[1][$_GET['ID']]);      unset($arrData[2][$_GET['ID']]);      unset($arrData[3][$_GET['ID']]);      unset($arrData[4][$_GET['ID']]);      $_SESSION['shopcar'] = $arrData;    }    header('Location:spcar.PHP');}

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