一、json_encode和json_decode區別

1、json_encode：對象/數組 ---> json

2、json_decode：json ---> 對象/數組

二、json_decode轉化為數組

轉化為數組時，第二個參數很重要：不加true會以PHP對象輸出, 加true輸出PHP數組，默認值為false

即：json_decode($str,true);

不加true時：

stdClass Object ( [data] => stdClass Object ( [access_token] => 3df2e217-fc2c-41b0-ae1f-b6da665e61ab [expires_in] => 604800 [refresh_token] => a3e7b36e-ecf7-4678-9f94-4d2bf16c4f8a [scope] => SCOPE [shop_id] => 1441968 [shop_name] => 吉祥傳承飾品 ) [err_no] => 0 [message] => success )

加true時：

Array ( [data] => Array ( [access_token] => 3df2e217-fc2c-41b0-ae1f-b6da665e61ab [expires_in] => 604800 [refresh_token] => a3e7b36e-ecf7-4678-9f94-4d2bf16c4f8a [scope] => SCOPE [shop_id] => 1441968 [shop_name] => 吉祥傳承飾品 ) [err_no] => 0 [message] => success )