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 (&).

    Changelog

    Version Description
    8.2.0 FILTER_FLAG_GLOBAL_RANGE as a flag to FILTER_VALIDATE_IP has been added.
    7.3.0 The explicit usage of FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED has been deprecated.
    7.1.0 FILTER_FLAG_EMAIL_UNICODE has been added.

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