thinkphp Template Judging output empty label usage

This article mainly introduces the thinkphp template to determine the output of the empty label usage, the need for friends can refer to the next

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:

<empty name= "variable name" > What to Output </empty>

The specific usage is shown in the following example:

<empty name= "username" >username Null value </empty

This example is equivalent to:

<?phpif (Empty ($username)) {  echo ' username is a null value ';}? >

If you judge a non-null value, you can use the Notempty label as follows:

<notempty name= "username" >username not empty </notempty>

Two tags can be combined to write:

<empty name= "username" >username null value <else/>username not empty </empty>