Filter
PHP Manual

filter_has_var

(PHP 5 >= 5.2.0, PECL filter:0.11.0)

filter_has_var — Checks if variable of specified type exists

说明

bool filter_has_var ( int $type , string $variable_name )

参数

type

One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, INPUT_ENV.

variable_name

Name of a variable to check.

返回值

如果成功则返回 TRUE,失败则返回 FALSE


Filter
PHP Manual