Parse error: syntax error, unexpected 'array_push' (T_STRING)

$critics = array('Lisa Rose' => array('Lady in the Water' => 2.5, 'Snakes on a Plane' => 3.5, 'Just My Luck' => 3.0),
	'Gene Seymour' => array('Lady in the Water' => 3.0, 'Snakes on a Plane' => 3.5, 'Just My Luck' => 1.5));

$list = array();
function test($prefs, $p1, $p2) {
	global $list;
	foreach(array_keys($prefs) as $item)
		if($item != $p1)
			foreach(array_keys($prefs[$item]) as $preferences)
				if (array_keys($prefs[$p1] == $preferences)
					array_push($list, $preferences);
}
#Find the number of elements
$count = count($list);
print_r (array_keys($critics));
test($critics, 'Lisa Rose', 'Gene Seymour');