Php/docs/filter.filters.flags

• PHP Manual
• Types of filters
• Filter flags

Filter flags

List of filter flags

ID	Used with	Description
FILTER_FLAG_STRIP_LOW	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips characters that have a numerical value <32.
FILTER_FLAG_STRIP_HIGH	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips characters that have a numerical value >127.
FILTER_FLAG_STRIP_BACKTICK	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW	Strips backtick characters.
FILTER_FLAG_ALLOW_FRACTION	FILTER_SANITIZE_NUMBER_FLOAT	Allows a period (.) as a fractional separator in numbers.
FILTER_FLAG_ALLOW_THOUSAND	FILTER_SANITIZE_NUMBER_FLOAT, FILTER_VALIDATE_FLOAT	Allows a comma (,) as a thousands separator in numbers.
FILTER_FLAG_ALLOW_SCIENTIFIC	FILTER_SANITIZE_NUMBER_FLOAT	Allows an e or E for scientific notation in numbers.
FILTER_FLAG_NO_ENCODE_QUOTES	FILTER_SANITIZE_STRING	If this flag is present, single (') and double (") quotes will not be encoded.
FILTER_FLAG_ENCODE_LOW	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_STRING, FILTER_SANITIZE_RAW	Encodes all characters with a numerical value <32.
FILTER_FLAG_ENCODE_HIGH	FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_SANITIZE_RAW	Encodes all characters with a numerical value >127.
FILTER_FLAG_ENCODE_AMP	FILTER_SANITIZE_STRING, FILTER_SANITIZE_RAW	Encodes ampersands (&).
FILTER_NULL_ON_FAILURE	FILTER_VALIDATE_BOOLEAN	Returns null for unrecognized boolean values.
FILTER_FLAG_ALLOW_OCTAL	FILTER_VALIDATE_INT	Regards inputs starting with a zero (0) as octal numbers. This only allows the succeeding digits to be 0-7.
FILTER_FLAG_ALLOW_HEX	FILTER_VALIDATE_INT	Regards inputs starting with 0x or 0X as hexadecimal numbers. This only allows succeeding characters to be a-fA-F0-9.
FILTER_FLAG_EMAIL_UNICODE	FILTER_VALIDATE_EMAIL	Allows the local part of the email address to contain Unicode characters.
FILTER_FLAG_IPV4	FILTER_VALIDATE_IP	Allows the IP address to be in IPv4 format.
FILTER_FLAG_IPV6	FILTER_VALIDATE_IP	Allows the IP address to be in IPv6 format.
FILTER_FLAG_NO_PRIV_RANGE	FILTER_VALIDATE_IP	Fails validation for the following private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Fails validation for the IPv6 addresses starting with FD or FC.
FILTER_FLAG_NO_RES_RANGE	FILTER_VALIDATE_IP	Fails validation for the following reserved IPv4 ranges: 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8 and 240.0.0.0/4. Fails validation for the following reserved IPv6 ranges: ::1/128, ::/128, ::ffff:0:0/96 and fe80::/10.
FILTER_FLAG_SCHEME_REQUIRED	FILTER_VALIDATE_URL	Requires the URL to contain a scheme part.
FILTER_FLAG_HOST_REQUIRED	FILTER_VALIDATE_URL	Requires the URL to contain a host part.
FILTER_FLAG_PATH_REQUIRED	FILTER_VALIDATE_URL	Requires the URL to contain a path part.
FILTER_FLAG_QUERY_REQUIRED	FILTER_VALIDATE_URL	Requires the URL to contain a query string.
FILTER_REQUIRE_SCALAR		Requires the value to be scalar.
FILTER_REQUIRE_ARRAY		Requires the value to be an array.
FILTER_FORCE_ARRAY		If the value is a scalar, it is treated as array with the scalar value as only element.

更新日志

版本	说明
7.3.0	The explicit usage of FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED has been deprecated.
7.1.0	FILTER_FLAG_EMAIL_UNICODE has been added.
5.3.2	FILTER_FLAG_STRIP_BACKTICK has been added.
5.2.10	FILTER_FLAG_NO_RES_RANGE supports also IPv6 addresses.