PHP Manual
Filter Functions
Checks if a variable of the specified type exists

filter_has_var

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

filter_has_var — Checks if a variable of the specified type exists

Description

filter_has_var(int $input_type, string $var_name): bool

Parameters

input_type: One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
var_name: Name of a variable to check.

Return Values

Returns true on success or false on failure.