FILTER_HAS_VAR
Checks if variable of specified type exists
SYNTAX
filter_has_var ( int $type , string $variable_name ) : bool
PARAMETERS
type
One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
variable_name
Name of a variable to check.
RETURN
Returns TRUE on success or FALSE on failure.
EXAMPLES
INPUT_GET
false
INPUT_POST
false
INPUT_COOKIE
false
INPUT_SERVER
false
INPUT_ENV
false