ThinkPHP template judgment output Empty tag usage details _ PHP Tutorial

The usage of the output Empty tag in the ThinkPHP template is described in detail. The empty tag of the ThinkPHP template is used 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 tag of the ThinkPHP template of the empty () function in PHP 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
   
  

  

  

  
Bytes. 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...