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php filter_has_var 判断变量是否存在函数

Jun 13, 2016 am 11:16 AM
filterhasphpvarfunctionjudgmentvariableexistusage

 

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)

	type
  • 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


例如
在这个例子中的输入变量“名称”发送到PHP页面:

<!--?phpif(!filter_has_var(INPUT_GET, "name")) { echo("Input type does not exist"); }else { echo("Input type exists"); }?-->
输出为.
 Input type exists

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