PHP : file_get_contents('php://input') or $HTTP_RAW_POST_DATA, which one is better to get the body o

PHP : file_get_contents("php://input") or $HTTP_RAW_POST_DATA, which one is better to get the body of JSON request?
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PHP : file_get_contents("php://input") or $HTTP_RAW_POST_DATA, which one is better to get the body of JSON request?
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$HTTP_RAW_POST_DATA, one body of which to request? file_get_contents("php://input") JSON is better : the or PHP get