I send to API
{
"method" : "mediatype.update"
"params" : [

{ "smtp_server" : "[email protected]", "mediatypeid" : 4 }

],
"auth" : "xxx",
"jsonrpc" : "2.0",
"id" : 1,
}

I expect
{"jsonrpc":"2.0","result":

{"mediatypeids":[4]}

,"id":1}
but get
{"jsonrpc":"2.0","result":

{"mediatypeids":true}

,"id":1}

So I modified frontends/php/api/classes/class.cmediatype.php

410d409
< $mediatypeids = zbx_objectValues($mediatypes, 'mediatypeid');
453c452
< DB::update('media_type', $update);
—
> $mediatypeids = DB::update('media_type', $update);