JSON formatting and serialize serialization, jsonserialize_PHP tutorial

JSON formatting and serialize serialization, jsonserialize

1. JSON formatting

1. What is JSON

JSON is a data storage format used to communicate the interaction between client-side Javascript and server-side PHP. We pass the string generated by JSON using PHP to the front-end Javascript, and Javascirpt can easily decode it into JSON and then apply it.

2. How to use JSON

PHP can use two functions, json_encode() and json_decode(), to operate JSON - one for encoding and one for decoding. json_encode() can convert an array into text data in json format for easy storage and reading, while json_decode() can directly convert json data into an array for easy calling.

<code class="hljs vbscript-html"><span class="xml"><span class="php"><span class="hljs-preprocessor"><?php</span>
    <span class="hljs-variable">$arr</span> = <span class="hljs-keyword">array</span>(
        <span class="hljs-string">'name'</span>    =<span class="hljs-string">'刘璐'</span>,
        <span class="hljs-string">'nick'</span>    =<span class="hljs-string">'璐小璐'</span>,
        <span class="hljs-string">'age'</span>     =<span class="hljs-string">'26'</span>,``
        <span class="hljs-string">'contact'</span> =<span class="hljs-keyword">array</span>(
            <span class="hljs-string">'phone'</span>   =<span class="hljs-string">'13718136109'</span>,
            <span class="hljs-string">'address'</span> =<span class="hljs-string">'Beijing ifdoo'</span>
        )
    );

    <span class="hljs-variable">$str</span> = json_encode(<span class="hljs-variable">$arr</span>);
    <span class="hljs-keyword">echo</span> <span class="hljs-string">"getProfile($str)"</span>;
<span class="hljs-preprocessor">?></span></span>
</span></code>

The result is:
{"name":"u5218u7490","nick":"u7490u5c0fu7490","age":"26","contact":{"phone":"13718136109","address":"u5317u4eac u5f97u8c46"}}

3. JSON format data and WEB front-end JS complete asynchronous interaction process

After PHP uses json_encode() to convert the array into json format data, this json string is equivalent to an array in JavaScript. After assigning it to a variable, you can operate on the array.

<code class="hljs haskell"><script <span class="hljs-typedef"><span class="hljs-keyword">type</span>="text/javascript></span>
    var arr = {<span class="hljs-string">"name"</span>:<span class="hljs-string">"\u5218\u7490"</span>,<span class="hljs-string">"nick"</span>:<span class="hljs-string">"\u7490\u5c0f\u7490"</span>,<span class="hljs-string">"age"</span>:<span class="hljs-string">"26"</span>,<span class="hljs-string">"contact"</span>:{<span class="hljs-string">"phone"</span>:<span class="hljs-string">"13718136109"</span>,<span class="hljs-string">"address"</span>:<span class="hljs-string">"\u5317\u4eac \u5f97\u8c46"</span>}};
    alert(arr.name);  
</script>  
</code>

4. Example

index.html

<code class="hljs vbscript-html"><span class="xml"><span class="hljs-tag"><<span class="hljs-title">html</span>></span>
<span class="hljs-tag"><<span class="hljs-title">head</span>></span>
    <span class="hljs-tag"><<span class="hljs-title">title</span>></span>json demo<span class="hljs-tag"></<span class="hljs-title">title</span>></span>
    <span class="hljs-tag"><<span class="hljs-title">script</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"text/javascript"</span>></span><span class="javascript">
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getProfile</span><span class="hljs-params">(str)</span> </span>{
        <span class="hljs-keyword">var</span> arr = str;
        <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">'nick'</span>).innerHTML = arr.nick;
    }
    </span><span class="hljs-tag"></<span class="hljs-title">script</span>></span>
<span class="hljs-tag"></<span class="hljs-title">head</span>></span>
<span class="hljs-tag"><<span class="hljs-title">body</span>></span>
    <span class="hljs-tag"><<span class="hljs-title">div</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"nick"</span>></span><span class="hljs-tag"></<span class="hljs-title">div</span>></span>
<span class="hljs-tag"></<span class="hljs-title">body</span>></span>

<span class="hljs-tag"><<span class="hljs-title">script</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"text/javascript"</span> <span class="hljs-attribute">src</span>=<span class="hljs-value">"./profile.php"</span>></span><span class="hljs-tag"></<span class="hljs-title">script</span>></span>
<span class="hljs-tag"></<span class="hljs-title">html</span>></span>
</span></code>

profile.php

<code class="hljs vbscript-html"><span class="xml"><span class="php"><span class="hljs-preprocessor"><?php</span>
    <span class="hljs-variable">$arr</span> = <span class="hljs-keyword">array</span>(
        <span class="hljs-string">'name'</span>    => <span class="hljs-string">'刘璐'</span>,
        <span class="hljs-string">'nick'</span>    => <span class="hljs-string">'璐小璐'</span>,
        <span class="hljs-string">'age'</span>     => <span class="hljs-string">'26'</span>,
        <span class="hljs-string">'contact'</span> => <span class="hljs-keyword">array</span>(
            <span class="hljs-string">'phone'</span>   => <span class="hljs-string">'13718136109'</span>,
            <span class="hljs-string">'address'</span> => <span class="hljs-string">'Beijing ifdoo'</span>
        )
    );

    <span class="hljs-variable">$str</span> = json_encode(<span class="hljs-variable">$arr</span>);
    <span class="hljs-keyword">echo</span> <span class="hljs-string">"getProfile($str)"</span>;
<span class="hljs-preprocessor">?></span></span>
</span></code>

• HTML page calls PHP file

  <script language="text/javascript" src="/xx/a.php"></script>

  The echo in a.php outputs javascript code.

• php page calls js file

  The method in echo js in a.php is enough.

2. serialize serialization

1. What is serialize

Serialize is to serialize variables and return a string expression with variable type and structure.

2. How to use serialize

Use PHP's serialize and unserialize to serialize and deserialize arrays.

<code class="hljs vbscript-html"><span class="xml"><span class="php"><span class="hljs-preprocessor"><?php</span>
    <span class="hljs-variable">$arr</span> = <span class="hljs-keyword">array</span>( 
        <span class="hljs-string">"u1"</span> => <span class="hljs-keyword">array</span>( 
            <span class="hljs-string">"gameName"</span> => <span class="hljs-string">"德乙"</span>, 
            <span class="hljs-string">"homeName"</span> => <span class="hljs-string">"比勒费尔德"</span>, 
            <span class="hljs-string">"guestName"</span> => <span class="hljs-string">"不伦瑞克"</span>, 
            <span class="hljs-string">"endTime"</span> => <span class="hljs-string">"2015-08-21"</span> 
        ), 
        <span class="hljs-string">"u2"</span> => <span class="hljs-keyword">array</span>( 
            <span class="hljs-string">"gameName"</span> => <span class="hljs-string">"英超"</span>, 
            <span class="hljs-string">"homeName"</span> => <span class="hljs-string">"水晶宫"</span>, 
            <span class="hljs-string">"guestName"</span> => <span class="hljs-string">"阿斯顿维拉"</span>, 
            <span class="hljs-string">"endTime"</span> => <span class="hljs-string">"2015-08-22"</span> 
        ) 
    ); 
    <span class="hljs-keyword">echo</span> serialize(<span class="hljs-variable">$arr</span>);
<span class="hljs-preprocessor">?></span></span>
</span></code>

The result is:

a:2:{s:2:"u1";a:4:{s:8:"gameName";s:6:"Germany 2";s:8:"homeName";s:15: "Bielefeld";s:9:"guestName";s:12:"Brunswick";s:7:"endTime";s:10:"2015-08-21";}s: 2:"u2";a:4:{s:8:"gameName";s:6:"Premier League";s:8:"homeName";s:9:"Crystal Palace";s:9:"guestName" ;s:15:"Aston Villa";s:7:"endTime";s:10:"2015-08-22";}}

Among them:

a:2 indicates that this is an array with two elements;
i:0 refers to the sequence index;
a:4 means there are 4 fields;
s:8:"gameName" indicates that this is an 8-character string

Summary: PHP's serialize serializes arrays for easy storage, and data in JSON format is not only easy to store but can also be read with other languages ​​such as javascript. If there is a lot of front-end and back-end interaction, it is recommended to use JSON. Combining PHP, Javascript, JSON and Ajax can complete powerful data interaction functions.

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