Predefined Constants

    The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

    INPUT_POST (int)
    POST variables.
    INPUT_GET (int)
    GET variables.
    COOKIE variables.
    INPUT_ENV (int)
    ENV variables.
    INPUT_SERVER (int)
    SERVER variables.
    INPUT_SESSION (int)
    SESSION variables. (not implemented yet)
    INPUT_REQUEST (int)
    REQUEST variables. (not implemented yet)
    FILTER_FLAG_NONE (int)
    No flags.
    FILTER_REQUIRE_SCALAR (int)
    Flag used to require scalar as input
    FILTER_REQUIRE_ARRAY (int)
    Require an array as input.
    FILTER_FORCE_ARRAY (int)
    Always returns an array.
    FILTER_NULL_ON_FAILURE (int)
    Use NULL instead of FALSE on failure.
    FILTER_VALIDATE_INT (int)
    ID of "int" filter.
    FILTER_VALIDATE_BOOL (int)
    Alias of FILTER_VALIDATE_BOOLEAN.
    FILTER_VALIDATE_BOOLEAN (int)
    ID of "boolean" filter.
    FILTER_VALIDATE_FLOAT (int)
    ID of "float" filter.
    FILTER_VALIDATE_REGEXP (int)
    ID of "validate_regexp" filter.
    FILTER_VALIDATE_URL (int)
    ID of "validate_url" filter.
    FILTER_VALIDATE_DOMAIN (int)
    ID of "validate_domain" filter. (Available as of PHP 7.0.0)
    FILTER_VALIDATE_EMAIL (int)
    ID of "validate_email" filter.
    FILTER_VALIDATE_IP (int)
    ID of "validate_ip" filter.
    FILTER_VALIDATE_MAC (int)
    ID of "validate_mac_address" filter.
    FILTER_DEFAULT (int)
    ID of default ("unsafe_raw") filter. This is equivalent to FILTER_UNSAFE_RAW.
    FILTER_UNSAFE_RAW (int)
    ID of "unsafe_raw" filter.
    FILTER_SANITIZE_STRING (int)
    ID of "string" filter. (Deprecated as of PHP 8.1.0, use htmlspecialchars() instead.)
    FILTER_SANITIZE_STRIPPED (int)
    ID of "stripped" filter. (Deprecated as of PHP 8.1.0, use htmlspecialchars() instead.)
    FILTER_SANITIZE_ENCODED (int)
    ID of "encoded" filter.
    FILTER_SANITIZE_SPECIAL_CHARS (int)
    ID of "special_chars" filter.
    FILTER_SANITIZE_EMAIL (int)
    ID of "email" filter.
    FILTER_SANITIZE_URL (int)
    ID of "url" filter.
    FILTER_SANITIZE_NUMBER_INT (int)
    ID of "number_int" filter.
    FILTER_SANITIZE_NUMBER_FLOAT (int)
    ID of "number_float" filter.
    FILTER_SANITIZE_MAGIC_QUOTES (int)
    ID of "magic_quotes" filter. (DEPRECATED as of PHP 7.3.0 and REMOVED as of PHP 8.0.0, use FILTER_SANITIZE_ADD_SLASHES instead.)
    FILTER_SANITIZE_ADD_SLASHES (int)
    ID of "add_slashes" filter. (Available as of PHP 7.3.0)
    FILTER_CALLBACK (int)
    ID of "callback" filter.
    FILTER_FLAG_ALLOW_OCTAL (int)
    Allow octal notation (0[0-7]+) in "int" filter.
    FILTER_FLAG_ALLOW_HEX (int)
    Allow hex notation (0x[0-9a-fA-F]+) in "int" filter.
    FILTER_FLAG_STRIP_LOW (int)
    Strip characters with ASCII value less than 32.
    FILTER_FLAG_STRIP_HIGH (int)
    Strip characters with ASCII value greater than 127.
    FILTER_FLAG_STRIP_BACKTICK (int)
    Strips backtick characters.
    FILTER_FLAG_ENCODE_LOW (int)
    Encode characters with ASCII value less than 32.
    FILTER_FLAG_ENCODE_HIGH (int)
    Encode characters with ASCII value greater than 127.
    FILTER_FLAG_ENCODE_AMP (int)
    Encode &.
    FILTER_FLAG_NO_ENCODE_QUOTES (int)
    Don't encode ' and ".
    FILTER_FLAG_EMPTY_STRING_NULL (int)
    (No use for now.)
    FILTER_FLAG_ALLOW_FRACTION (int)
    Allow fractional part in "number_float" filter.
    FILTER_FLAG_ALLOW_THOUSAND (int)
    Allow thousand separator (,) in "number_float" filter.
    FILTER_FLAG_ALLOW_SCIENTIFIC (int)
    Allow scientific notation (e, E) in "number_float" filter.
    FILTER_FLAG_PATH_REQUIRED (int)
    Require path in "validate_url" filter.
    FILTER_FLAG_QUERY_REQUIRED (int)
    Require query in "validate_url" filter.
    FILTER_FLAG_SCHEME_REQUIRED (int)
    Require scheme in "validate_url" filter. (Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied in the filter already.)
    FILTER_FLAG_HOST_REQUIRED (int)
    Require host in "validate_url" filter. (Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied in the filter already.)
    FILTER_FLAG_HOSTNAME (int)
    Require hostnames to start with an alphanumeric character and contain only alphanumerics or hyphens. (Available as of PHP 7.0.0)
    FILTER_FLAG_IPV4 (int)
    Allow only IPv4 address in "validate_ip" filter.
    FILTER_FLAG_IPV6 (int)
    Allow only IPv6 address in "validate_ip" filter.
    FILTER_FLAG_NO_RES_RANGE (int)
    Deny reserved addresses in "validate_ip" filter.
    FILTER_FLAG_NO_PRIV_RANGE (int)
    Deny private addresses in "validate_ip" filter.
    FILTER_FLAG_EMAIL_UNICODE (int)
    Accepts Unicode characters in the local part in "validate_email" filter. (Available as of PHP 7.1.0)

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