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) INPUT_GET
(int) INPUT_ENV
(int) INPUT_SERVER
(int) INPUT_SESSION
(int) INPUT_REQUEST
(int) FILTER_FLAG_NONE
(int) FILTER_REQUIRE_SCALAR
(int) FILTER_REQUIRE_ARRAY
(int) FILTER_FORCE_ARRAY
(int) FILTER_NULL_ON_FAILURE
(int) FILTER_VALIDATE_INT
(int) FILTER_VALIDATE_BOOL
(int) FILTER_VALIDATE_BOOLEAN
. FILTER_VALIDATE_BOOLEAN
(int) FILTER_VALIDATE_FLOAT
(int) FILTER_VALIDATE_REGEXP
(int) FILTER_VALIDATE_URL
(int) FILTER_VALIDATE_DOMAIN
(int) FILTER_VALIDATE_EMAIL
(int) FILTER_VALIDATE_IP
(int) FILTER_VALIDATE_MAC
(int) FILTER_DEFAULT
(int) FILTER_UNSAFE_RAW
. FILTER_UNSAFE_RAW
(int) FILTER_SANITIZE_STRING
(int) FILTER_SANITIZE_STRIPPED
(int) FILTER_SANITIZE_ENCODED
(int) FILTER_SANITIZE_SPECIAL_CHARS
(int) FILTER_SANITIZE_EMAIL
(int) FILTER_SANITIZE_URL
(int) FILTER_SANITIZE_NUMBER_INT
(int) FILTER_SANITIZE_NUMBER_FLOAT
(int) FILTER_SANITIZE_MAGIC_QUOTES
(int) FILTER_SANITIZE_ADD_SLASHES
instead.) FILTER_SANITIZE_ADD_SLASHES
(int) FILTER_CALLBACK
(int) FILTER_FLAG_ALLOW_OCTAL
(int) 0[0-7]+
) in "int" filter. FILTER_FLAG_ALLOW_HEX
(int) 0x[0-9a-fA-F]+
) in "int" filter. FILTER_FLAG_STRIP_LOW
(int) FILTER_FLAG_STRIP_HIGH
(int) FILTER_FLAG_STRIP_BACKTICK
(int) FILTER_FLAG_ENCODE_LOW
(int) FILTER_FLAG_ENCODE_HIGH
(int) FILTER_FLAG_ENCODE_AMP
(int) &
. FILTER_FLAG_NO_ENCODE_QUOTES
(int) '
and "
. FILTER_FLAG_EMPTY_STRING_NULL
(int) FILTER_FLAG_ALLOW_FRACTION
(int) FILTER_FLAG_ALLOW_THOUSAND
(int) ,
) in "number_float" filter. FILTER_FLAG_ALLOW_SCIENTIFIC
(int) e
, E
) in "number_float" filter. FILTER_FLAG_PATH_REQUIRED
(int) FILTER_FLAG_QUERY_REQUIRED
(int) FILTER_FLAG_SCHEME_REQUIRED
(int) FILTER_FLAG_HOST_REQUIRED
(int) FILTER_FLAG_HOSTNAME
(int) FILTER_FLAG_IPV4
(int) FILTER_FLAG_IPV6
(int) FILTER_FLAG_NO_RES_RANGE
(int) FILTER_FLAG_NO_PRIV_RANGE
(int) FILTER_FLAG_EMAIL_UNICODE
(int)