Why is php mixed in html not output?

Why does the mixed php code in html not output? & lt; table & nbsp; whidth = 500 & nbsp; border = "0" & nbsp; align = "center" & nbsp; cellpadding = "5" & nbsp; cellspacing = "1" & nbsp; bgcolor = "# add3ef" why do you not output mixed php code in html?

 
  

  $ SQL = "select * from message ";
  
$ Query = mysql_query ($ SQL );
  
While ($ row = mysql_fetch_array ($ query ))
  
{
  
?>
  

  
Title:
  User:
   
  

  

  
Content:
  
  

  

  }
  
?>
  

  

 

$ Row [title] the output of all items retrieved from the database is null, and can be output in a separate loop. why? Php html database mysql shared:
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