php - read json object clean and sanitize for database storage -

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hi need send json data php script , unpack, clean , sanitize insertion in database problem not know how data php script , read, says index undefined. ajax request looks like

$.ajax({         type: "post",         url: "save.php",         data:{param:my_people},          success: function(data){         //success here means ajax call succeeded, not data works     alert(data);     }     });

this php looks like

 $data = json_decode($_post['my_people']);

the truth not know how work json ajax , php. highly welcome!

if variable my_people javasript valid,
$_post['param'] should contain my_people datas....

did try write
die(json_ecode($_post)); or die(json_ecode($_get));
in first line of save.php see coming ajax ?

aahh.. save.php file editing
, code using $.ajax on same directory ?


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