Usage of the output Empty tag determined by the ThinkPHP template _ php instance

This article mainly introduces the use of the ThinkPHP template to determine the output Empty tag. For more information, see the empty tag of the ThinkPHP template to determine whether the template variable is null.

The empty tag of the ThinkPHP template is used to determine whether the template variable is null. its function is equivalent to the empty () function in PHP. The empty label format is as follows:

 
  
Content to be output

 

The usage is as follows:

 
  
Username is null

  


  
This example is equivalent:

  


  
<? Phpif (empty ($ username) {echo 'username is null ';}?>

  


  
If a non-null value is determined, the notempty label can be used as follows:


  


  
   
    
Username is not empty

   

  


  
The two tags can be combined as follows:

  


  
   
    
Username is null

    Username is not empty