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php filter_has_var 判断变量是否存在函数

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Release: 2016-06-13 11:16:47
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定义和用法
该filter_has_var ( )函数检查,如果一个变量指定输入类型存在。

在返回TRUE或FALSE成功的失败。

语法

filter_has_var(type, variable)
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	type
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  • 必需的。指定类型检查可能存在的输入类型: INPUT_GET
  • INPUT_POST
  • INPUT_COOKIE
  • INPUT_SERVER
  • INPUT_ENV
variable 必需的。指定变量检查
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例如
在这个例子中的输入变量“名称”发送到PHP页面:
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<!--?phpif(!filter_has_var(INPUT_GET, "name")) { echo("Input type does not exist"); }else { echo("Input type exists"); }?-->
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输出为.
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 Input type exists
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