Filter flags

List of filter flags

ID	Used with	Description
FILTER_FLAG_STRIP_LOW	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips characters that have a numerical value <32.
FILTER_FLAG_STRIP_HIGH	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips characters that have a numerical value >127.
FILTER_FLAG_STRIP_BACKTICK	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips backtick characters.
FILTER_FLAG_NO_ENCODE_QUOTES	FILTER_SANITIZE_STRING	If this flag is present, single (') and double (") quotes will not be encoded.
FILTER_FLAG_ENCODE_LOW	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Encodes all characters with a numerical value <32.
FILTER_FLAG_ENCODE_HIGH	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Encodes all characters with a numerical value >127.
FILTER_FLAG_ENCODE_AMP	FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Encodes ampersands (&).