Use of JSON in php_PHP tutorial-PHP Tutorial-php.cn

Use of JSON in php_PHP tutorial

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Release： 2016-07-13 10:29:27

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Starting from version 5.2, PHP natively provides json_encode() and json_decode() functions, the former is used for encoding, and the latter is used for decoding.

json_encode() This function is mainly used to convert arrays and objects into json format.

Output result:

<span>$arr</span> = <span>array</span> ('a'=>'a','b'=>'b','c'='c','d'=>'d','e'='e'<span>);
</span><span>echo</span> json_encode(<span>$arr</span>);

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json only accepts utf-8 encoded characters, and the parameters of json_encode() must be utf-8 encoded.

Use of JSON in php_PHP tutorial Output result:

<span>class</span><span> person
{
    </span><span>public</span> <span>$name</span><span>;
    </span><span>public</span> <span>$age</span><span>;
    </span><span>public</span> <span>$height</span><span>;
    </span><span>function</span> __construct(<span>$name</span>,<span>$age</span>,<span>$height</span><span>)
    {
        </span><span>$this</span>->name = <span>$name</span><span>;
        </span><span>$this</span>->age = <span>$age</span><span>;
        </span><span>$this</span>->height = <span>$height</span><span>;    
    }   
}

</span><span>$obj</span> = <span>new</span> person("zhangsan",20,100<span>);
</span><span>$foo_json</span> = json_encode(<span>$obj</span><span>);
</span><span>echo</span> <span>$foo_json</span>;

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When the attributes in the class are private variables, they will not be output.

Use of JSON in php_PHP tutorial

json_decode()

This function is used to convert json text into the corresponding PHP data structure. Output result:

Normally, json_decode() always returns a PHP object.

<span>$json</span> = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}'<span>;
</span><span>var_dump</span>(json_decode(<span>$json</span>));

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converted into array:

Use of JSON in php_PHP tutorial

<span>$json</span> = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}'<span>;
</span><span>var_dump</span>(json_decode(<span>$json</span>,ture));

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Use of JSON in php_PHP tutorial

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