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***