title: Undefined error $_POST index
body: <p>Can someone please explain what does undefined error means on this link?</p>
  
  <p>Whenever i visit my forum page it does gives me this error undefined index fpost.</p>
  
  <p>fpost is the text area holder for the message. Obviously there is still no content in fpost when you initially visit the page, i don't know why it's propmting an error i already have <code>if( isset($_POST['fpost']) &amp;&amp; $_POST['fpost']!=='' )</code> condition to eliminate the error but it's not working...</p>
  
  <p>I haven't even click the post button to begin with</p>
  
  <blockquote>
    <p><strong>Notice:</strong> Undefined index: fpost in ... on line 231</p>
  </blockquote>
  
  <p>I don't understand the words people are using, can you please explain it in laymans term where beginners will understand. Thanks in advance.</p>