Selecting column dynamically with curly braces - php

Question

I am trying to select a column with curly braces, but the column has a prefix, for example:
//sql to run
$sql = "SELECT * FROM trades
WHERE trade_market = ?
AND trade_buysell = ?
" . $order . "";
//run the sql
$tickersHigh = $database->prepare($sql);
$tickersHigh->execute(array(strtolower($market), $buysell));
//fetch the results
$tickerHigh = $tickersHigh->fetch();
//return the results
return $tickerHigh->trade_{$type};
Since I have added trade_ to my column name it no longer works, it used to work like so:
return $tickerHigh->{$type};
But I recently added the prefix trade_ to my columns, like so:
return $tickerHigh->trade_{$type};
And I get the error:
Column not found: 1054 Unknown column 'PRICE' in 'order clause'
It should be selecting trade_price rather than just price
so how can I get this to work with my prefix too?
My table:
CREATE TABLE `trades` (
`trade_id` int(11) NOT NULL,
`trade_amount` text NOT NULL,
`trade_market` varchar(25) NOT NULL,
`trade_cost` varchar(25) NOT NULL,
`trade_fee` varchar(25) NOT NULL,
`trade_time` time NOT NULL,
`trade_user` varchar(25) NOT NULL,
`trade_ip` varchar(25) NOT NULL,
`trade_price` text NOT NULL,
`trade_buysell` text NOT NULL,
`trade_date` datetime NOT NULL,
`trade_maincoin` text NOT NULL,
`trade_charttime` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

try
return $tickerHigh->{"trade_$type"};