(PHP 5 >= 5.2.0, PHP 7, PHP 8)
filter_has_var — Checks if variable of specified type exists
$input_type
$var_name
input_type
One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
INPUT_GET
INPUT_POST
INPUT_COOKIE
INPUT_SERVER
INPUT_ENV
var_name
Name of a variable to check.
Returns true on success or false on failure.
true
false