预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

INPUT_POST ( integer )

POST variables.

INPUT_GET ( integer )

GET variables.

INPUT_COOKIE ( integer )

COOKIE variables.

INPUT_ENV ( integer )

ENV variables.

INPUT_SERVER ( integer )

SERVER variables.

INPUT_SESSION ( integer )

SESSION variables. (not implemented yet)

INPUT_REQUEST ( integer )

REQUEST variables. (not implemented yet)

FILTER_FLAG_NONE ( integer )

No flags.

FILTER_REQUIRE_SCALAR ( integer )

Flag used to require scalar as input

FILTER_REQUIRE_ARRAY ( integer )

Require an array as input.

FILTER_FORCE_ARRAY ( integer )

Always returns an array.

FILTER_NULL_ON_FAILURE ( integer )

Use NULL instead of FALSE on failure.

FILTER_VALIDATE_INT ( integer )

ID of "int" filter.

FILTER_VALIDATE_BOOLEAN ( integer )

ID of "boolean" filter.

FILTER_VALIDATE_FLOAT ( integer )

ID of "float" filter.

FILTER_VALIDATE_REGEXP ( integer )

ID of "validate_regexp" filter.

FILTER_VALIDATE_URL ( integer )

ID of "validate_url" filter.

FILTER_VALIDATE_EMAIL ( integer )

ID of "validate_email" filter.

FILTER_VALIDATE_IP ( integer )

ID of "validate_ip" filter.

FILTER_VALIDATE_MAC ( integer )

ID of "validate_mac_address" filter. (Available as of PHP 5.5.0)

FILTER_DEFAULT ( integer )

ID of default ("unsafe_raw") filter. This is equivalent to FILTER_UNSAFE_RAW .

FILTER_UNSAFE_RAW ( integer )

ID of "unsafe_raw" filter.

FILTER_SANITIZE_STRING ( integer )

ID of "string" filter.

FILTER_SANITIZE_STRIPPED ( integer )

ID of "stripped" filter.

FILTER_SANITIZE_ENCODED ( integer )

ID of "encoded" filter.

FILTER_SANITIZE_SPECIAL_CHARS ( integer )

ID of "special_chars" filter.

FILTER_SANITIZE_EMAIL ( integer )

ID of "email" filter.

FILTER_SANITIZE_URL ( integer )

ID of "url" filter.

FILTER_SANITIZE_NUMBER_INT ( integer )

ID of "number_int" filter.

FILTER_SANITIZE_NUMBER_FLOAT ( integer )

ID of "number_float" filter.

FILTER_SANITIZE_MAGIC_QUOTES ( integer )

ID of "magic_quotes" filter.

FILTER_CALLBACK ( integer )

ID of "callback" filter.

FILTER_FLAG_ALLOW_OCTAL ( integer )

Allow octal notation (0[0-7]+) in "int" filter.

FILTER_FLAG_ALLOW_HEX ( integer )

Allow hex notation (0x[0-9a-fA-F]+) in "int" filter.

FILTER_FLAG_STRIP_LOW ( integer )

Strip characters with ASCII value less than 32.

FILTER_FLAG_STRIP_HIGH ( integer )

Strip characters with ASCII value greater than 127.

FILTER_FLAG_ENCODE_LOW ( integer )

Encode characters with ASCII value less than 32.

FILTER_FLAG_ENCODE_HIGH ( integer )

Encode characters with ASCII value greater than 127.

FILTER_FLAG_ENCODE_AMP ( integer )

Encode &.

FILTER_FLAG_NO_ENCODE_QUOTES ( integer )

Don't encode ' and ".

FILTER_FLAG_EMPTY_STRING_NULL ( integer )

(No use for now.)

FILTER_FLAG_ALLOW_FRACTION ( integer )

Allow fractional part in "number_float" filter.

FILTER_FLAG_ALLOW_THOUSAND ( integer )

Allow thousand separator (,) in "number_float" filter.

FILTER_FLAG_ALLOW_SCIENTIFIC ( integer )

Allow scientific notation (e, E) in "number_float" filter.

FILTER_FLAG_PATH_REQUIRED ( integer )

Require path in "validate_url" filter.

FILTER_FLAG_QUERY_REQUIRED ( integer )

Require query in "validate_url" filter.

FILTER_FLAG_IPV4 ( integer )

Allow only IPv4 address in "validate_ip" filter.

FILTER_FLAG_IPV6 ( integer )

Allow only IPv6 address in "validate_ip" filter.

FILTER_FLAG_NO_RES_RANGE ( integer )

Deny reserved addresses in "validate_ip" filter.

FILTER_FLAG_NO_PRIV_RANGE ( integer )

Deny private addresses in "validate_ip" filter.