JSON在php中的使用_PHP教程

从5.2版本开始，PHP原生提供json_encode()和json_decode()函数，前者用于编码，后者用于解码。

json_encode()                                                                       

该函数主要用来将数组和对象，转换为json格式。

<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>);

输出结果：

json只接受utf-8编码的字符，json_encode()的参数必须是utf-8编码。

<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>;

输出结果：

当类中的属性为私有变量的时候，则不会输出。

json_decode()                                                                       

该函数用于将json文本转换为相应的PHP数据结构。

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

输出结果：

通常情况下，json_decode()总是返回一个PHP对象。

转成数组的：

<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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