Example analysis of serialize serialization and json performance testing in php_PHP tutorial

最近需要对大数组做存储，需要在serialize序列化和json之间做了选择。因此需要做了性能测试。

在php5.2之前对数组存储的时候，大都使用serialize系列化。php5.2之后，开始内置了 JSON 的支持。

在网上看到有些资料说：json_encode和json_decode比内置的serialize和unserialize函数要高效。耳闻不如眼见，眼见不一定为实。那就用实际数据测试吧.....

我们先理解概念：

一、 序列化

序列化是将对象状态转换为可保持或可传输的格式的过程。与序列化相对的是反序列化，它将流转换为对象。这两个过程结合起来，可以轻松地存储和传输数据。

将对象的状态信息转换为可以存储或传输的窗体的过程。 在序列化期间，对象将其当前状态写入到临时或持久性存储区。以后，可以通过从存储区中读取或反序列化对象的状态，重新创建该对象。

通常，对象实例的所有字段都会被序列化，这意味着数据会被表示为实例的序列化数据。这样，能够解释该格式的代码有可能能够确定这些数据的值，而不依赖于该成员的可访问性。类似地，反序列化从序列化的表示形式中提取数据，并直接设置对象状态，这也与可访问性规则无关。 对于任何可能包含重要的安全性数据的对象，如果可能，应该使该对象不可序列化。如果它必须为可序列化的，请尝试生成特定字段来保存不可序列化的重要数据。如果无法实现这一点，则应注意该数据会被公开给任何拥有序列化权限的代码，并确保不让任何恶意代码获得该权限。

二、 JSON

JSON, JavaScript Object Notation, a lighter and more friendly format for data exchange through interfaces (AJAX, REST, etc.). JSON is a text format for serializing structured data. As an alternative to XML, it is used to represent the payload of data exchange between clients and servers. It is derived from the ECMAScript language standard. JSON's design goals are to make it small, lightweight, textual, and a subset of JavaScript. JSON adopts a completely language-independent text format, but also uses conventions similar to the C language family (including C, C++, C#, Java, JavaScript, Perl, Python, etc.). These properties make JSON an ideal data exchange language. Easy for humans to read and write, and easy for machines to parse and generate.

JSON construction has two structures:
1. A collection of name/value pairs . In different languages, it is understood as an object, a record, a struct, a dictionary, a hash table, a keyed list, or an associative array. array).

2. An ordered list of values. In most languages, it is understood as an array.

Test:

3. Actual Test

Executed under PHP 5.3: We first use small data for testing:

Copy the code The code is as follows:

        $target = array (   
       'battle_id'=> 257   
       ,'user_id'=> 41248   
       ,'user_id2'=> 23989   
       ,'player'=> 41248   
       ,'formation'=> Array   
            (   
               '41248'=> 1   
               ,'23989'=> 2   
            )   

       ,'result'=> 1   
       ,'battle_type'=> 1   
       ,'speed'=> Array   
            (   
               '41248'=> 0   
               ,'23989'=> 0   
            )   
            );   

    $json = json_encode($target);   
    $seri = serialize($target);   

    echo "json :" , strlen($json) ,'
';   
    echo "serialize :", strlen($seri) ,'
';   

    $stime = microtime(true);   
    for ($i = 0; $i         json_encode($target);   
    }   
    $etime = microtime(true);   

    echo "json_encode :", ($etime - $stime) ,'
';   

    //----------------------------------   

    $stime = microtime(true);   
    for ($i = 0; $i        json_decode($json,true);   
    }   
    $etime = microtime(true);   

    echo "json_decode :", ($etime - $stime),'
';   

    //----------------------------------   
    $stime = microtime(true);   
    for ($i = 0; $i         serialize($target);   
    }   
    $etime = microtime(true);   

    echo "serialize :", ($etime - $stime) ,'
';   

    //----------------------------------   
    $stime = microtime(true);   
    for ($i = 0; $i         unserialize($seri);   
    }   
    $etime = microtime(true);   

    echo "unserialize :", ($etime - $stime),'
';   

    ?>   

测试结果：

json :156
serialize :222
json_encode :0.1087498664856
json_decode :0.12652111053467
serialize :0.041656017303467
unserialize :0.040987968444824

测试结果看出json效率稍微比serialize差点，在php5.2可能会更差。应该是在php5.3之后，json扩展做了优化。

然后使用大数组做测试(代码放到最后，因为代码的数组比较长)：

测试结果：

json :5350
serialize :8590
json_encode :0.90479207038879
json_decode :1.753741979599
serialize :1.3566699028015
unserialize :1.3003630638123

我们可以看出，serialize比json差了快一个数量级。

总结：

1） 空间的比较

serialize在编码后大概是json的1.5倍。

Reason:

• After serializing, the string contains the length of the substring. This may be a speed optimization, but the test results are unsatisfactory.
• Serialize has more detailed type distinctions, while json only has four types, and they are represented by simple symbols.
• 2) Comparison of speed
• In the case of smaller data, serialize is orders of magnitude faster than json.
  

  In the case of large data volume, json is slightly worse than serialize

  3) Processing objects
  json cannot handle data such as object methods.

  4) Scope of use

  • Use serialize for serialization, especially for object storage. This is the meaning of its existence.
  • Object-independent data storage can use json, such as arrays containing large numbers, etc.
  • • JSON is generally used for front-end and back-end interactions. In addition, Currently JSON only supports UTF-8 encoded data.

Copy code The code is as follows:

 
$target = array ( 
   'battle_id'=> 257 
   ,'user_id'=> 41248 
   ,'user_id2'=> 23989 
   ,'player'=> 41248 
   ,'formation'=> Array ('41248'=> 1  ,'23989'=> 2) 
   ,'result'=> 1 
   ,'battle_type'=> 1 
   ,'speed'=> Array( '41248'=> 0,'23989'=> 0  ) 
   ,'attacker'=> Array( 
    '1'=> Array ( 
                   'user_id'=> 41248 
                   ,'soldier_id'=> 28 
                   ,'prototype_id'=> 4 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3997 
                   ,'hp'=> 3997 
                   ,'attack_general'=> 346 
                   ,'attack_skill'=> 596 
                   ,'attack_explode'=> 458 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 2 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0) 
           ,'4'=> Array ( 
                   'user_id'=> 41248 
                   ,'soldier_id'=> 29 
                   ,'prototype_id'=> 2 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3555 
                   ,'hp'=> 3555 
                   ,'attack_general'=> 396 
                   ,'attack_skill'=> 581 
                   ,'attack_explode'=> 418 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0 
                ) 
           ,'5'=> Array                ( 
                   'user_id'=> 41248 
                   ,'soldier_id'=> 30 
                   ,'prototype_id'=> 6 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3043 
                   ,'hp'=> 3043 
                   ,'attack_general'=> 351 
                   ,'attack_skill'=> 540 
                   ,'attack_explode'=> 474 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0) 
           ,'7'=> Array ( 
                   'user_id'=> 41248 
                   ,'soldier_id'=> 37 
                   ,'prototype_id'=> 2 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3491 
                   ,'hp'=> 3491 
                   ,'attack_general'=> 393 
                   ,'attack_skill'=> 532 
                   ,'attack_explode'=> 456 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0   )) 
   ,'defender'=> Array( 
           '2'=> Array( 
                   'user_id'=> 23989 
                   ,'soldier_id'=> 24 
                   ,'prototype_id'=> 1 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3230 
                   ,'hp'=> 3230 
                   ,'attack_general'=> 390 
                   ,'attack_skill'=> 567 
                   ,'attack_explode'=> 442 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0) 
           ,'5'=> Array( 
                   'user_id'=> 23989 
                   ,'soldier_id'=> 25 
                   ,'prototype_id'=> 2 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3400 
                   ,'hp'=> 3400 
                   ,'attack_general'=> 379 
                   ,'attack_skill'=> 536 
                   ,'attack_explode'=> 405 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0 ) 
           ,'7'=> Array( 
                   'user_id'=> 23989 
                   ,'soldier_id'=> 26 
                   ,'prototype_id'=> 6 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3669 
                   ,'hp'=> 3669 
                   ,'attack_general'=> 362 
                   ,'attack_skill'=> 549 
                   ,'attack_explode'=> 426 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0 ) 
           ,'9'=> Array( 
                   'user_id'=> 23989 
                   ,'soldier_id'=> 27 
                   ,'prototype_id'=> 1 
                   ,'bid'=> 1 
                   ,'level'=> 1 
                   ,'rare'=> 1 
                   ,'skill_id'=> 1 
                   ,'totalhp'=> 3618 
                   ,'hp'=> 3618 
                   ,'attack_general'=> 326 
                   ,'attack_skill'=> 510 
                   ,'attack_explode'=> 419 
                   ,'attack_type'=> 1 
                   ,'defense'=> 0 
                   ,'anger'=> 50 
                   ,'dodge'=> 2 
                   ,'crit'=> 2 
                   ,'block'=> 0 
                   ,'block_effect'=> 0.5 
                   ,'crit_effect'=> 2 
                   ,'foramtion_effect'=> 0) ) 
   ,'battle_process'=> Array( 
           '0'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'1'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'2'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 
           ,'3'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'4'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 
           ,'5'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'6'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'7'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 
           ,'8'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'9'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 
           ,'10'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 
           ,'11'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=> 0 
                   ,'state'=> 0 
                ) 

           ,'12'=> Array( 
                   'user_id'=> 41248 
                   ,'asid'=> 28 
                   ,'bsid'=> Array( '0'=> 26 ) 
                   ,'harm'=> Array('0'=> 1650) 
                   ,'dhp'=> Array('0'=> 2019  ) 
                   ,'attacker_anger'=> 66 
                   ,'defender_anger'=> Array('0'=> 94 ) 
                   ,'skill'=&g