title: How to get the length of a MySQL int field
body: <p>I have a MySQL table with int fields of different length:</p>
  
  <p><img src="https://i.stack.imgur.com/NNPs5.gif" alt="MySql mediumint and tinyint fields of different lenght"></p>
  
  <p>How do I find out the length <code>(nav_parent = 4, nav_show = 2, nav_order = 2)</code>
  with PHP PDO?</p>