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。
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INPUT_POST
(integer)
-
POST variables.
-
INPUT_GET
(integer)
-
GET variables.
-
INPUT_COOKIE
(integer)
-
COOKIE variables.
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INPUT_ENV
(integer)
-
ENV variables.
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INPUT_SERVER
(integer)
-
SERVER variables.
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INPUT_SESSION
(integer)
-
SESSION variables.
(not implemented yet)
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INPUT_REQUEST
(integer)
-
REQUEST variables.
(not implemented yet)
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FILTER_FLAG_NONE
(integer)
-
No flags.
-
FILTER_REQUIRE_SCALAR
(integer)
-
Flag used to require scalar as input
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FILTER_REQUIRE_ARRAY
(integer)
-
Require an array as input.
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FILTER_FORCE_ARRAY
(integer)
-
Always returns an array.
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FILTER_NULL_ON_FAILURE
(integer)
-
Use NULL instead of FALSE on failure.
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FILTER_VALIDATE_INT
(integer)
-
ID of "int" filter.
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FILTER_VALIDATE_BOOLEAN
(integer)
-
ID of "boolean" filter.
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FILTER_VALIDATE_FLOAT
(integer)
-
ID of "float" filter.
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FILTER_VALIDATE_REGEXP
(integer)
-
ID of "validate_regexp" filter.
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FILTER_VALIDATE_URL
(integer)
-
ID of "validate_url" filter.
-
FILTER_VALIDATE_EMAIL
(integer)
-
ID of "validate_email" filter.
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FILTER_VALIDATE_IP
(integer)
-
ID of "validate_ip" filter.
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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.
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FILTER_SANITIZE_ENCODED
(integer)
-
ID of "encoded" filter.
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FILTER_SANITIZE_SPECIAL_CHARS
(integer)
-
ID of "special_chars" filter.
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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.
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FILTER_SANITIZE_MAGIC_QUOTES
(integer)
-
ID of "magic_quotes" filter.
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FILTER_CALLBACK
(integer)
-
ID of "callback" filter.
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FILTER_FLAG_ALLOW_OCTAL
(integer)
-
Allow octal notation (0[0-7]+) in "int" filter.
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FILTER_FLAG_ALLOW_HEX
(integer)
-
Allow hex notation (0x[0-9a-fA-F]+) in "int" filter.
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FILTER_FLAG_STRIP_LOW
(integer)
-
Strip characters with ASCII value less than 32.
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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.
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FILTER_FLAG_ENCODE_HIGH
(integer)
-
Encode characters with ASCII value greater than 127.
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FILTER_FLAG_ENCODE_AMP
(integer)
-
Encode &.
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FILTER_FLAG_NO_ENCODE_QUOTES
(integer)
-
Don't encode ' and ".
-
FILTER_FLAG_EMPTY_STRING_NULL
(integer)
-
(No use for now.)
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FILTER_FLAG_ALLOW_FRACTION
(integer)
-
Allow fractional part in "number_float" filter.
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FILTER_FLAG_ALLOW_THOUSAND
(integer)
-
Allow thousand separator (,) in "number_float" filter.
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FILTER_FLAG_ALLOW_SCIENTIFIC
(integer)
-
Allow scientific notation (e, E) in
"number_float" filter.
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FILTER_FLAG_SCHEME_REQUIRED
(integer)
-
Require scheme in "validate_url" filter.
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FILTER_FLAG_HOST_REQUIRED
(integer)
-
Require host in "validate_url" filter.
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FILTER_FLAG_PATH_REQUIRED
(integer)
-
Require path in "validate_url" filter.
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FILTER_FLAG_QUERY_REQUIRED
(integer)
-
Require query in "validate_url" filter.
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FILTER_FLAG_IPV4
(integer)
-
Allow only IPv4 address in "validate_ip" filter.
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FILTER_FLAG_IPV6
(integer)
-
Allow only IPv6 address in "validate_ip" filter.
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FILTER_FLAG_NO_RES_RANGE
(integer)
-
Deny reserved addresses in "validate_ip" filter.
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FILTER_FLAG_NO_PRIV_RANGE
(integer)
-
Deny private addresses in "validate_ip" filter.