ThinkPHP template judgment output Empty tag usage detailed explanation_PHP tutorial

The empty tag of ThinkPHP template is used to determine whether the template variable is empty.

ThinkPHP template empty tag is used to determine whether the template variable is empty. Its function is equivalent to the empty() function behavior in PHP. The empty tag uses the following format:

<empty name="变量名">要输出的内容</empty>

The specific usage is as shown in the following example:

<empty name="username">username 为空值</empty

This example is equivalent to:

<&#63;php
if(empty($username)){
  echo 'username 为空值';
}
&#63;>

If you determine a non-empty value, you can use the notempty tag, as shown below:

<notempty name="username">username 不为空</notempty>

The two tags combined can be written as:

<empty name="username">username 为空值<else/>username 不为空</empty>