How to retrieve POST parameters containing a json object in PHP -

i need write codes in php parameters post page. 1 of these parameters json object.

i know in general. can use following code post values.

$value=$_post["pram_name"]; 

and if post json object page. can do:

$json = file_get_contents('php://input'); $obj=json_decode($json, true); 

but if post several parameters 1 json object. cannot use above method data.

does know way so?

i know way work around putting parameters in json object. reason, sender of post values cannot that.

thank you.