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In thinkphp, you can use the empty tag to determine whether the variable is empty, the function of the tag is to determine whether the template variable is empty, its function is equivalent to the empty () function in PHP, and the syntax is "content to be output".

This article operating environment: Windows10 system, ThinkPHP5 version, Dell G3 computer.

Thinkphp5 determines whether the variable is empty

The ThinkPHP template empty tag is used to determine whether the template variable is null or not, and its function is equivalent to the behavior of the empty () function in PHP. The format of empty tags is as follows:

What is to be output

The specific usage is shown in the following example:

Username is null

This example is equivalent to:

If you determine that a non-null value is not null, you can use the notempty tag, as follows:

Username is not empty

The two tags can be combined to write:

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