常见用法 
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::

    json_decode ( string $json [, bool $assoc = false ]
    1. $json: This function only works with UTF-8 encoded data.
    2. $assoc: 当该参数为 TRUE 时，将返回 array 而非 object 

    string json_encode ( mixed $value)
    1. $json: This function only works with UTF-8 encoded data.

::

    intval($var);
    var_dump($var);