ThinkPHP template determines the usage of output Empty tag

This article mainly introduces the usage of the Empty tag in ThinkPHP template judgment output. Friends who need it can refer to

The empty tag of ThinkPHP template is used to judge 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 format of the empty tag is as follows:

<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:

<?php
if(empty($username)){
  echo &#39;username 为空值&#39;;
}
?>

If you judge a non-empty value, you can use the notempty tag, as follows Shown:

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

The two tags can be combined to write:

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

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