Home Backend Development PHP Problem The difference between php serialization functions

The difference between php serialization functions

Sep 16, 2019 pm 05:54 PM
php the difference

The difference between php serialization functions

serialize() //把变量和它们的值编码成文本形式,即产生一个可存储的值的表示
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Detailed explanation:

##serialize() Returns a string, this string contains A byte stream representing value, which can be stored anywhere. This facilitates storing or passing PHP values ​​without losing their type and structure.

unserialize() //恢复原先变量。
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Detailed explanation:

unserialize() Operate on a single serialized variable and convert it Returns the value to PHP. If the passed string is not deserializable, returns FALSE and produces an E_NOTICE.

$arr=array();
$arr['name']='张三';
$arr['age']='22';
$arr['sex']='男';
$arr['phone']='123456789';
$arr['address']='上海市浦东新区';
var_dump($arr);

//输出:
//  array(5) { 
//  ["name"]=> string(6) "张三"
//  ["age"]=> string(2) "22"
//  ["sex"]=> string(3) "男"
//  ["phone"]=> string(9) "123456789"
//  ["address"]=> string(21) "上海市浦东新区"
//   }

//序列化:
$info=serialize($arr);
var_dump($info);

//输出:
//string(140) "a:5:{s:4:"name";s:6:"张三";s:3:"age";s:2:"22";s:3:"sex";s:3:"男";s:5:"phone";s:9:"123456789";s:7:"address";s:21:"上海市浦东新区";}"

   ////////////////////////说明/////////////////////////////////
//**a:5标志序列化为array包含5个键值对,s:4标志内容为字符串包含4个字符。**//


$zhangsan=unserialize($info);
var_dump($zhangsan);

//输出:
//  array(5) { 
//  ["name"]=> string(6) "张三"
//  ["age"]=> string(2) "22"
//  ["sex"]=> string(3) "男"
//  ["phone"]=> string(9) "123456789"
//  ["address"]=> string(21) "上海市浦东新区"
//   }
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If you want to change the serialized string back into a PHP value, you can use unserialize(). serialize() can handle any type except resource. You can even serialize() arrays that contain references to themselves. References in the array/object you are serializing() will also be stored.

When serializing an object, PHP will attempt to call the object's member function __sleep() before the sequence action. This allows any cleanup operations to be done before the object is serialized. Similarly, when an object is restored using unserialize(), the __wakeup() member function will be called.

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