Detailed examples of PHP serialize and JSON parsing_PHP tutorial

JSON is based on a subset of JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON uses 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.

JSON is constructed from two structures:

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).

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

PHP’s serialize is to serialize variables and return a string expression with variable type and structure.
Speaking of which, both embody a data structure in the form of a string. , so what is the difference between them.

Let’s start with JSON and look at a simple example.

Example 1:

<ol class="dp-c">
<li class="alt"><span><span class="keyword"><strong><font color="#006699">var</font></strong></span><span> test = {</span><span class="string"><font color="#0000ff">"Name"</font></span><span>:</span><span class="string"><font color="#0000ff">"Peter"</font></span><span>,</span><span class="string"><font color="#0000ff">"Age"</font></span><span>:20};  </span></span></li>
<li>
<span>document.write(test.Name + </span><span class="string"><font color="#0000ff">": "</font></span><span> + test.Age); </span>
</li>
</ol>

Display results:

Peter: 20

{"Name":"Peter","Age in variable test ":20} is an object with 2 elements (it feels like an array in PHP):
Name is Peter and Age is 20.

Of course it can get more complicated.

Example 2:

<ol class="dp-xml">
<li class="alt"><span><span>var </span><span class="attribute"><font color="#ff0000">test</font></span><span> = {"User":{"Name":"Peter","Age":20},"Company":"FORD"};  </span></span></li>
<li><span>document.write(test.User.Name + ": " + test.Company); </span></li>
</ol>

Display results:

Peter: FORD In this example, the User element contains Name and Age.

If you want to reflect multiple Users, you need to use an array. Different from the "{}" of the object, the array uses "[]".

JSON parsing example three:

<ol class="dp-xml">
<li class="alt"><span><span>var </span><span class="attribute"><font color="#ff0000">test</font></span><span> = [  </span></span></li>
<li><span>                 {"User":{"Name":"Peter","Age":20},"Company":"FORD"},  </span></li>
<li class="alt"><span>                 {"User":{"Name":"Li Ming","Age":20},"Company":"Benz"}  </span></li>
<li><span>              ];  </span></li>
<li class="alt"><span>document.write(test[1].User.Name + ": " + test[1].Company);  </span></li>
<li><span>//或者使用：document.write(test[1]["User"]["Name"] + ": " + test[1]["Company"]); </span></li>
</ol>

JSON parsing display results:

Li Ming: Benz

Through the above simple examples, some complex The data is passed through a string, and it is indeed much more convenient to use Ajax.
Let’s take a look at the role of PHP’s serialize function.

JSON parsing example four:

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">arr</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span> </span></span></li>
<li><span>       (  </span></li>
<li class="alt">
<span>          'Peter'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array  </span>
</li>
<li><span>          (  </span></li>
<li class="alt">
<span>            'Country'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'USA',  </span>
</li>
<li>
<span>            'Age'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>20  </span>
</li>
<li class="alt"><span>          ),  </span></li>
<li>
<span>          'Li Ming'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array  </span>
</li>
<li class="alt"><span>          (  </span></li>
<li>
<span>             'Country'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>'CHINA',  </span>
</li>
<li class="alt">
<span>             'Age'=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>21  </span>
</li>
<li><span>          )  </span></li>
<li class="alt"><span>        );  </span></li>
<li><span> </span></li>
<li class="alt">
<span>$</span><span class="attribute-value"><font color="#0000ff">serialize</font></span><span class="attribute"><font color="#ff0000">serialize_var</font></span><span> = serialize($arr);  </span>
</li>
<li><span>echo $serialize_var; </span></li>
</ol>

JSON parsing display result:

<ol class="dp-xml"><li class="alt"><span><span>a:2:{s:5:"Peter";a:2:{s:7:"Country";s:3:"USA";s:3:"Age";i:20;}s:7:"Li Ming";a:2:{s:7:"Country";s:5:"CHINA";s:3:"Age";i:21;}} </span></span></li></ol>

This result looks more complicated than JSON, but it is actually very simple. What is explained is some data types and structures.
Take a:2:{s:7:"Country";s:3:"USA";s:3:"Age";i:20;} as an example:

a:2 Indicates that this is an array with two elements. s:7:"Country";s:3:"USA"; is the first element. s:7 indicates that this is a string with 7 characters. ), followed by i:20; should also be guessed to be an integer (integer) 20.

Look at this example again,

Example 5:

<ol class="dp-c">
<li class="alt"><span><span class="keyword"><strong><font color="#006699">class</font></strong></span><span> test  </span></span></li>
<li><span>{  </span></li>
<li class="alt">
<span>    </span><span class="keyword"><strong><font color="#006699">var</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$var</font></span><span> = 0;  </span>
</li>
<li>
<span>    </span><span class="keyword"><strong><font color="#006699">function</font></strong></span><span> add(){  </span>
</li>
<li class="alt">
<span>      </span><span class="func">echo</span><span> </span><span class="vars"><font color="#dd0000">$var</font></span><span>+10;  </span>
</li>
<li><span>    }  </span></li>
<li class="alt"><span>}  </span></li>
<li><span> </span></li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$unserialize_var</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> test;  </span>
</li>
<li>
<span></span><span class="vars"><font color="#dd0000">$serialize_var</font></span><span> = serialize(</span><span class="vars"><font color="#dd0000">$unserialize_var</font></span><span>);  </span>
</li>
<li class="alt">
<span></span><span class="func">echo</span><span> </span><span class="vars"><font color="#dd0000">$serialize_var</font></span><span>;  </span>
</li>
<li>
<span></span><span class="vars"><font color="#dd0000">$unserialize_var</font></span><span> = null;  </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$unserialize_var</font></span><span> = unserialize(</span><span class="vars"><font color="#dd0000">$serialize_var</font></span><span>);  </span>
</li>
<li>
<span></span><span class="vars"><font color="#dd0000">$unserialize_var</font></span><span>->add(); </span>
</li>
</ol>

Display results:

O:4:"test":1:{ s:3:"var";i:0;}

10

As you can see from this example, serialize saves both the type and structure of the data, and
unserialize The variables after can still use the add() method.

So is there any connection between PHP and JSON? Friends who are familiar with PHP should know that PHP5.2.0 has set JSON extension as the default component, which means that we can perform JSON operations in PHP, and its functions are json_encode and json_decode.

Example 6:

<ol class="dp-c">
<li class="alt"><span><span class="vars"><font color="#dd0000">$arr</font></span><span> = </span><span class="keyword"><strong><font color="#006699">array</font></strong></span><span> </span></span></li>
<li><span>       (  </span></li>
<li class="alt">
<span>          </span><span class="string"><font color="#0000ff">'Name'</font></span><span>=></span><span class="string"><font color="#0000ff">'Peter'</font></span><span>,  </span>
</li>
<li>
<span>          </span><span class="string"><font color="#0000ff">'Age'</font></span><span>=>20  </span>
</li>
<li class="alt"><span>       );  </span></li>
<li><span> </span></li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$jsonencode</font></span><span> = json_encode(</span><span class="vars"><font color="#dd0000">$arr</font></span><span>);  </span>
</li>
<li>
<span></span><span class="func">echo</span><span> </span><span class="vars"><font color="#dd0000">$jsonencode</font></span><span>; </span>
</li>
</ol>

Display results:

{"Name":"Peter","Age":20}

This result is the same as the test value in Example 1. Use json_encode to convert the variables in PHP into JSON characters and output the expression.
Let’s take a look at the usage of json_decode.

Example 7:

<ol class="dp-c">
<li class="alt"><span><span class="vars"><font color="#dd0000">$var</font></span><span> = </span><span class="string"><font color="#0000ff">'{"Name":"Peter","Age":20}'</font></span><span>;  </span></span></li>
<li>
<span></span><span class="vars"><font color="#dd0000">$jsondecode</font></span><span> = json_decode(</span><span class="vars"><font color="#dd0000">$var</font></span><span>);  </span>
</li>
<li class="alt">
<span>print_r(</span><span class="vars"><font color="#dd0000">$jsondecode</font></span><span>); </span>
</li>
</ol>

Display results:

<ol class="dp-c"><li class="alt"><span><span>stdClass Object ( [Name] => Peter [Age] => 20 ) </span></span></li></ol>

This is indeed verified, in JSON {"Name":"Peter","Age" :20} is an object, but it can also be converted into an array in PHP by setting the ASSOC parameter to True in json_decode.
Example 8:

<ol class="dp-c">
<li class="alt"><span><span class="vars"><font color="#dd0000">$var</font></span><span> = </span><span class="string"><font color="#0000ff">'{"Name":"Peter","Age":20}'</font></span><span>;  </span></span></li>
<li>
<span></span><span class="vars"><font color="#dd0000">$jsondecode</font></span><span> = json_decode(</span><span class="vars"><font color="#dd0000">$var</font></span><span>,true);  </span>
</li>
<li class="alt">
<span>print_r(</span><span class="vars"><font color="#dd0000">$jsondecode</font></span><span>); </span>
</li>
</ol>

Display results:

<ol class="dp-c"><li class="alt"><span><span>Array ( [Name] => Peter [Age] => 20 ) </span></span></li></ol>

In addition, it should be noted that JSON is based on Unicode format, so to perform Chinese operations, it must be converted into UTF -8 format. Through the above examples, I believe everyone has a preliminary understanding of serialize and json_encode of JSON and PHP. By combining PHP, Javascript, JSON and Ajax, powerful data interaction functions can be completed.

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