在写序列化serialize与反序列化unserialize()时，我们先来看看：
serialize — 产生一个可存储的值的表示
描述
string serialize ( mixed $value )
serialize() 返回字符串，此字符串包含了表示 value 的字节流，可以存储于任何地方。
这有利于存储或传递 PHP 的值，同时不丢失其类型和结构。
想要将已序列化的字符串变回 PHP 的值，可使用 unserialize()。serialize() 可处理除了 resource 之外的任何类型。甚至可以 serialize() 那些包含了指向其自身引用的数组。你正 serialize() 的数组／对象中的引用也将被存储。
当序列化对象时，PHP 将试图在序列动作之前调用该对象的成员函数 __sleep()。这样就允许对象在被序列化之前做任何清除操作。类似的，当使用 unserialize() 恢复对象时， 将调用 __wakeup() 成员函数。
个人实际项目中的理解
序列化serialize()就是可以将多个字段的值如 name、vaule、sex、money等存储在数据库表中一个字段里如extend_params，而不用另外开辟那么多字段，使用的时候就要先反序列化extend_params
上代码
下面的代码是我在帘易购项目中计价算法中用到的（ECShop）
/**
* 添加定制商品到购物车
*/
public function add_customizationOp() {
if (floatval($_POST['width']) <= 0 || floatval($_POST['height']) <= 0 || floatval($_POST['c_height']) <= 0) {
echo '请选择正确的尺寸';
exit;
}
$goods = Model()->table('goods,goods_common')->join('left')->on('goods.goods_commonid = goods_common.goods_commonid')->where(array('goods_common.goods_commonid' => array('in', $_POST['goods'])))->select();
if (empty($goods)) {
echo '请选择好合适的款式面料';
exit;
}
$class = $this->_get_class_list(1573);
$gc_array = array();
foreach ($class as $val) {
$gc_array[$val['gc_id']] = $val['gc_name'];
}
foreach ($goods as $key => $val) {
if ($val['gc_id'] == 1574) {
$ratio = unserialize($val['ratio']);
break;
}
}
if (empty($ratio) || empty($goods)) {
echo '请选择好合适的款式面料';
exit;
}
$extend_params['width'] = floatval($_POST['width']);
$extend_params['height'] = floatval($_POST['height']);
$extend_params['c_height'] = floatval($_POST['c_height']);
$extend_params['hl'] = floatval($_POST['hl']);
$extend_params['settle'] = ' 计价类型：特别定制';
if (isset($_POST['pay_message']) && !empty($_POST['pay_message'])) {
$extend_params['pay_message'] = trim($_POST['pay_message']);
}
$insert_array = array();
$extend_params['total_price'] = 0;
$count = count($goods);
$i = 1;
$sum = 0;
$item_id = time() . rand(1000, 9999);
foreach ($goods as $val) {
if ($val['gc_id'] == 1574 || (isset($ratio[$val['gc_id']]) && !empty($ratio[$val['gc_id']]) && intval($ratio[$val['gc_id']]) > 0)) {
if ($val['goods_storage'] - $_POST['quantity'] < 0) {
echo $val['goods_name'] . '库存不足';
exit;
} else {
$param['goods_num'] = $_POST['quantity'];
}
if ($val['gc_id'] == 1574) {
$param['goods_price'] = $val['goods_price'] * $extend_params['width'];
}elseif($val['gc_id'] == 1589||$val['gc_id'] == 1590){
$param['goods_price'] = $val['goods_price'] * floatval($ratio[$val['gc_id']]) / 100;
} else {
$extend_params['mianliao'] = $gc_array[$val['gc_id']];
$param['goods_price'] = $val['goods_price'] * $extend_params['width'] * floatval($ratio[$val['gc_id']]) / 100;
}
if ($extend_params['height'] - 0.6 > 0) {
$param['goods_price'] = $param['goods_price'] * $extend_params['height'] / 0.45;
}
$sum += $param['goods_price'];
if ($i == $count) {
$extend_params['num'] = $count;
$extend_params['sum'] = sprintf("%.2f", $sum);
}
$param['goods_price'] = sprintf("%.2f", $param['goods_price']);
$param['buyer_id'] = $this->member_info['member_id'];
$param['store_id'] = $this->member_info['bd_store_id'];
$param['goods_id'] = $val['goods_id'];
$param['goods_name'] = $val['goods_name'];
$param['type'] = 2;
$param['customization_id'] = $item_id;
$param['goods_image'] = $val['goods_image'];
$param['store_name'] = $val['store_name'];
$param['extend_params'] = serialize($extend_params); //重点
$insert_array[] = $param;
unset($extend_params['mianliao']);
$i++;
}
}
//日志
$da['f_id']=$count;
$da['f_name']=json_encode($ratio);
$da['f_ip']='11';
$da['t_id']=$i;
$da['t_name']='111';
$da['t_msg']=json_encode($goods);
$da['add_time']=time();
Model()->table('chat_log')->insert($da);
$res = Model()->table('cart')->insertAll($insert_array);
if ($res) {
echo 1;
exit;
} else {
echo '添加失败';
exit;
}
}
```
***关键***
$param['extend_params'] = serialize($extend_params); //重点
***序列化效果***
a:5:{s:5:"width";s:1:"2";s:6:"height";s:1:"0";s:11:"pay_message";s:6:"书房";s:11:"goods_price";s:5:"28.00";s:6:"settle";s:22:" 计价类型：定制";}
```
看到这里就知道serialize()作用性的了
那下面就来看看 是怎么用到unserialize()
/**
* 购物车列表
*/
public function cart_listOp() {
$model_cart = Model('cart');
$condition = array('buyer_id' => $this->member_info['member_id']);
$cart_list = $model_cart->listCart('db', $condition);
$sum = 0; //商品总价
$num = 0; //商品数量
$all_click = 3; //是否全选
if (isset($_GET['height'])) {
Tpl::output('height', intval($_GET['height']));
} else {
Tpl::output('height', 0);
}
foreach ($cart_list as $key => $value) {
if (!empty($value['extend_params'])) {
$extend_params = unserialize($value['extend_params']); //重点
$value['extend_params1'] = '';
$value['extend_params2'] = '';
if (isset($extend_params['settle'])) {
$value['extend_params1'] .= $extend_params['settle'];
}
if (isset($extend_params['width']) && floatval($extend_params['width']) > 0) {
$value['extend_params1'] .= " 宽度：" . floatval($extend_params['width']) . "米";
}
if (isset($extend_params['height']) && floatval($extend_params['height']) > 0) {
$value['extend_params1'] .= " 高度：" . floatval($extend_params['height']) . "米";
}
if (isset($extend_params['c_height']) && floatval($extend_params['c_height']) > 0) {
$value['extend_params1'] .= " 窗高：" . floatval($extend_params['c_height']) . "米";
}
if (isset($extend_params['hl'])) {
if ($extend_params['hl'] == 1) {
$value['extend_params2'] .= " 魔术贴：正面";
} else if ($extend_params['hl'] == 2) {
$value['extend_params2'] .= " 魔术贴：反面";
} else if ($extend_params['hl'] == 3) {
if (!isset($extend_params['mianliao'])) {
$value['extend_params2'] .= "无魔术贴";
}
}
//定制商品
$cart_list[$key]['num'] = $extend_params['num'];
$cart_list[$key]['sum'] = $extend_params['sum'];
if (isset($extend_params['mianliao'])) {
$value['extend_params2'] .= " " . $extend_params['mianliao'];
}
}
if (isset($extend_params['interfacing'])) {
if ($extend_params['interfacing'] == 1) {
$value['extend_params2'] .= " 衬布：遮光衬布";
} else if ($extend_params['interfacing'] == 2) {
$value['extend_params2'] .= " 衬布：不遮光衬布";
} else if ($extend_params['interfacing'] == 0) {
$value['extend_params2'] .= " 衬布：无衬布";
}
}
$cart_list[$key]['cunbucloth'] = $extend_params['cunbucloth'];
$cart_list[$key]['cunbumon'] = $extend_params['cunbumon'];
$cart_list[$key]['pay_message'] = $extend_params['pay_message'];
$cart_list[$key]['extend_params1'] = $value['extend_params1'];
$cart_list[$key]['extend_params2'] = $value['extend_params2'];
$cart_list[$key]['goods_sum'] = ncPriceFormat($extend_params['sum'] * $value['goods_num']);
if($extend_params['sum']){
$cart_list[$key]['goods_sum'] = ncPriceFormat($extend_params['sum'] * $value['goods_num']);
}else{
$cart_list[$key]['goods_sum'] = ncPriceFormat($value['goods_price'] * $value['goods_num']);
}
}
$cart_list[$key]['goods_image_url'] = cthumb($value['goods_image'], $value['store_id']);
$cart_list[$key]['goods_price'] = $value['goods_price'];
$cart_list[$key]['quantity'] = $value['goods_num']; //单笔订单购买的产品数量
$cart[] = $cart_list[$key];
if ($value['click'] == 1) {
$sum += $cart_list[$key]['goods_sum'];
$num += $cart_list[$key]['goods_num'];
} else {
$all_click = 2;
}
}// dump($cart);
// exit(-1);
Tpl::output('cart', $cart);
Tpl::output('all_click', $all_click);
Tpl::output('num', $num);
Tpl::output('sum', ncPriceFormat($sum));
Tpl::showpage('cart');
}
重点
$extend_params = unserialize($value['extend_params']); //重点下面你就可以直接用$extend_params 来定位到你需要的数据了
总结
做项目不要怕Bug，要敢于面对它并把它真正的解决，当我做这个项目的时候，我并不是很清楚地知道序列化和反序列化的真正用法，我是先序列化了，然后要用的时候没有序列化，而直接去 $value['extend_params']['sum']这样去找，所以它是找不到数据的，后来经过反复试错，我懂得了得反序列化它，然后就可以直接这样用$extend_params['sum']，故接触得多，懂得也就多啦，不用怕自己现在很多都不会，重要的是自己肯去接触肯去理解
注：文章来源雨中笑记录实习期遇到的问题与心得，转载请申明原文