title: php get for POST or use value
body: <p>I have a php function which gets a value from previous page but I want to have an existing value just in case if I leave the field empty.</p>
  
  <p>Example:</p>
  
  <pre><code>$age = $_POST['age']; 
  </code></pre>
  
  <p>want to add if statament if age is empty user 50 as a value</p>