PHP implements multiple serialization/deserialization methods
This article mainly introduces how to implement various serialization/deserialization methods in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
Summary: Serialization is the process of converting a variable into a string that can be saved or transmitted; deserialization is to convert this string into the original variable at the appropriate time for use. These two processes combined make it easy to store and transfer data, making programs more maintainable..
Serialization is the process of converting variables into strings that can be saved or transferred; deserialization is Convert this string into the original variable and use it when appropriate. These two processes combine to easily store and transfer data, making the program more maintainable.
1. serialize and unserialize functions
These two are common functions for serializing and deserializing data in PHP.
<?php
$a = array('a' => 'Apple' ,'b' => 'banana' , 'c' => 'Coconut');
//序列化数组
$s = serialize($a);
echo $s;
//输出结果：a:3:{s:1:"a";s:5:"Apple";s:1:"b";s:6:"banana";s:1:"c";s:7:"Coconut";}
echo '<br /><br />';
//反序列化
$o = unserialize($s);
print_r($o);
//输出结果 Array ( [a] => Apple [b] => banana => Coconut )
?>//反序列化 $o = unserialize($s); print_r($o); //输出结果 Array ( [a] => Apple [b] => banana => Coconut ) ?>
When array values contain characters such as double quotes, single quotes, or colons, they are After deserialization, problems may occur. To overcome this problem, a neat trick is to use base64_encode and base64_decode.
$obj = array(); //序列化 $s = base64_encode(serialize($obj)); //反序列化 $original = unserialize(base64_decode($s));
But base64 encoding will increase the length of the string. To overcome this problem, it can be used with gzcompress.
//定义一个用来序列化对象的函数
function my_serialize( $obj )
{
return base64_encode(gzcompress(serialize($obj)));
}
//反序列化
function my_unserialize($txt)
{
return unserialize(gzuncompress(base64_decode($txt)));
}2. json_encode and json_decode
Using JSON format serialization and deserialization is a good choice ：
Using json_encode and json_decode format output is much faster than serialize and unserialize format.
JSON format is readable.
JSON format returns smaller data than serialize.
The JSON format is open and portable. Other languages can use it as well.
$a = array('a' => 'Apple' ,'b' => 'banana' , 'c' => 'Coconut');
//序列化数组
$s = json_encode($a);
echo $s;
//输出结果：{"a":"Apple","b":"banana","c":"Coconut"}
echo '<br /><br />';
//反序列化
$o = json_decode($s);In the above example, the json_encode output length is obviously shorter than the serialize output length in the previous example.
3. var_export and eval
var_export function outputs the variable as a string; eval executes the string as a PHP code, and deserializes it to obtain the original variable content.
$a = array('a' => 'Apple' ,'b' => 'banana' , 'c' => 'Coconut'); //序列化数组 $s = var_export($a , true); echo $s; //输出结果： array ( 'a' => 'Apple', 'b' => 'banana', 'c' => 'Coconut', ) echo '<br /><br />'; //反序列化 eval('$my_var=' . $s . ';'); print_r($my_var);
4. wddx_serialize_value and wddx deserialize
wddx_serialize_value function can serialize array variables and convert them into XML strings form output.
$a = array('a' => 'Apple' ,'b' => 'banana' , 'c' => 'Coconut'); //序列化数组 $s = wddx_serialize_value($a); echo $s; //输出结果（查看输出字符串的源码）：<wddxPacket version='1.0'><header/><data><struct><var name='a'><string>Apple</string></var><var name='b'><string>banana</string></var><var name='c'><string>Coconut</string></var></struct></data></wddxPacket> echo '<br /><br />'; //反序列化 $o = wddx_deserialize($s); print_r($o); //输出结果：Array ( [a] => Apple [b] => banana 1 => Coconut )
It can be seen that there are many XML tag characters, so the serialization of this format still takes up a lot of space.
Summary
All the above functions can be executed normally when serializing array variables, but it is different when applied to objects. For example, json_encode serialized objects will fail. When deserializing objects, unserialize and eval will have different effects.
The above is the entire content of this article, I hope it will be helpful to everyone's study.
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