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ThinkPHP模板判断输出Present标签用法详解_PHP

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2016-06-01 11:51:52924browse

ThinkPHP

ThinkPHP模板的present标签用于判断模板变量是否已经赋值

ThinkPHP模板引擎的present标签用来判断模板变量是否已经赋值,其功能相当于PHP中的isset()函数行为,格式如下:

<present name="变量名">要输出的内容</present>

用法举例如下:

<present name="username">{$username} 你好!</present>

该例子等同于:

if(isset($username)){
  echo "$username 你好!";
}

此外,判断没有赋值可采用notpresent标签,用法如下:

<notpresent name="username">username不存在活未登录</notpresent>

还可以把上述两个标签合并为:

<present name="username">{$username} 你好!<else/>username不存在活未登录</present>
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