thinkphp Template Judging output empty label usage detailed _php tutorial

The empty label of the thinkphp template is used to determine if the template variable is a null value.

The thinkphp template empty label is used to determine if the template variable is null, and its function is equivalent to the empty () function behavior in PHP. The empty label uses the following format:

 
  
   
  The content to output
 
  

The specific usage is shown in the following example:

 
  
    username is a null value 
   
 This example is equivalent to: 
 
   
<?phpif (Empty ($ username) {echo ' username is a null value ';}?
   
 
   
 If you determine a non-null value, you can use the Notempty label as follows: 
 
 
   
 
    
     
   Username not empty 
     
 
   
 Two tags can be written as: 
 
   
 
    
      Username Null value 
     username not empty 
     
 
   
 
 
   
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 The thinkphp template empty label is used to determine if the template variable is null, and its function is equivalent to the empty () function behavior in PHP ...  
 
   
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