title: Do shared hosts grant access to INFORMATION_SCHEMAs?
body: <p>I was wondering if shared hosts generally grant access to this table to their users.</p>
  
  <p>Would it be ok to rely on it to quickly get the current database structure from within a script?</p>
  
  <p>My idea was to use this information to sanitize input lol. For example: <code>UPDATE table SET field = ?</code></p>
  
  <p><code>?</code> can be a parameter (I'm using PDO), but what if I wanted to make <code>field</code> a variable to? Since PDO doesn't support that, I could use data from the info schema to find out if that column exists...</p>