html - PHP - Setting a specific $variable to NULL -

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So if I have this code in PHP: 

  $ class_name;

And I want to put it in my markup like this: 

  ...

In this case how can I declare as variable? Which of the following is the best: 

  $ class_name; $ Class_name = ""; $ Class_name = NULL; Edit: I am using HTML code in an external HTML file for one of my HTML files (I use the  requirement  ). Therefore, the first php file should be  class = "wrap"  in the div.wrap and other file has its  class = "wrap red" . 
 
  
  $ class_name = "";   
 
 
 
 If you intend to use it regularly in string context, the following things are considered empty: 
 < Ul> 
  •   (with an empty string) Test with  empty () . 
     
     / Em> 
    •  
  •  0  (0 as an integer)  
    •  
  •  0.0  (0 as a float)  
    •  
  •  "0"  (0 string 
    •  
  •  False 
    •  
  •  Array ()  (an empty array)  
    •  
  •  $ var;  (a variable declared, but without any value)  
    •   
     come For example, in your update, there is no trailing white space after  class = "wrap" , but  class = " Wrap red ". If you do not pay attention to the white space on the back, and you are confident that your variable will always be a string, even if it is an empty string, Can go well with implementation, and when the variable skins You will be receiving  class = "wrap" . 
     
     I think that it always feels good to be as accurate as possible. Thus, when I'm not aligning the string, I used to put a check to prevent white space on the back. 
     
      ...

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