ThinkPHP template Switch tag usage example_PHP tutorial

The switch tag in the ThinkPHP template is used to output different values ​​in the template according to different situations.

ThinkPHP template engine supports switch judgment and can output different results according to different conditions. The usage format is as follows:

<switch name="变量名" >
<case value="值1">输出内容1</case>
<case value="值2">输出内容2</case>
<default />默认情况
</switch>

Usage examples are as follows:

<switch name="uid">
<case value="1">管理员</case>
<default />游客
</switch>

Note here:

The name attribute can use functions and system variables. Its attribute value is the variable name without the $ symbol, while the value value needs the $ symbol when using a variable, as shown in the example above.

When the value of value is used in variable mode, it no longer supports the simultaneous judgment of multiple conditions , such as the following multi-condition judgment.

Multi-condition judgment:
The value attribute of case can support the simultaneous judgment of multiple conditions and use the | symbol to separate:

<switch name="Think.get.type">
<case value="gif|png|jpeg">图像格式文件</case>
<default />其他格式文件
</switch>

This means that if the value of $_GET["type"] is gif, png or jpg, it will be judged as an image format.

The name attribute can also be a system variable, and the function can be used, such as:

<switch name="Think.get.username|function1">
......
</switch>

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