Show Value Only If Not Empty - PHP -

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I have found a form where some fields are optional I then display these areas.

I am trying to show only one value from my database if there is a value. Otherwise, do not show anything.

If there is a value, it needs to be displayed - 

  & lt; div class = 'category' style = 'font-size: 20px; Background color: f2f2f2 '; ". $ Line ['project_category']" & lt; / Div & gt;   
 Do I 'if (strlen ($ prjcat)> 0)'?  
 Thank you!   
 
 
 If you are checking a  if  statement that the value is empty :  
  if (empty ($ line ['project_category'])) {echo "

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