PHP：SQL查询从任何表中选择php数组提供的列

I have array of columns which I want to search from table.

I am looking to use SQL something like :

$columns = array('a', 'b', 'c');
$sql = "select $columns from table";

Is this possible? How can we perform such action?

A part of it is possible:

$columns = array('a','b','c');
$sql = "Select ".implode(",", $columns) . " from table....";

PHP implode Manual

EDIT

I'm afraid, it is not possible to exclude the table-name! But you can query first all table names and then select from those.