//array is $trade
//print_r($trade); results below
//how would i sort this array by the trade_force value?

Array ( 
	[1] => Array ( 
		[trade_id] => 1 
		[trade_url] => http://www.sitea.com 
		[trade_hitsin] => 6 
		[trade_hitsout] => 0 
		[trade_rawin] => 0 
		[trade_niche] => 1 
		[trade_force] => 0 
		[trade_hour] => 0 
	) 
	[2] => Array ( 
		[trade_id] => 2 
		[trade_url] => http://www.siteb.com 
		[trade_hitsin] => 13 
		[trade_hitsout] => 2 
		[trade_rawin] => 11 
		[trade_niche] => 3 
		[trade_force] => 50 
		[trade_hour] => 2 ) 
	[3] => Array ( 
		[trade_id] => 3 
		[trade_url] => http://www.sitec.com  
		[trade_hitsin] => 3 
		[trade_hitsout] => 4 
		[trade_rawin] => 3 
		[trade_niche] => 3 
		[trade_force] => 2 
		[trade_hour] => 1 
	)
)