php - Error when running MySQL query, looking for right syntax

I get the following error when running my .php file:

You have an error in your SQL syntax; check the manual that

corresponds to your MySQL server version for the right syntax to use
near ''feeds_list' SET 'cron' = now() WHERE 'feed_id' = '1'' at line 1

Here is the code:

$sql = mysql_query("UPDATE 'feeds_list' SET 'cron' = now() WHERE 'feed_id' = '$feed_id'") or die (mysql_error());

Thanks for helping me out

Answer

Remove the '' around table names and column names, it should be:

UPDATE feeds_list SET cron = now() WHERE feed_id = '$feed_id'

or use a backticks (``).