Filter
PHP Manual

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 (integer)
POST variables.
INPUT_GET (integer)
GET variables.
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_DEFAULT (integer)
ID of default ("string") filter.
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.
Filter
PHP Manual