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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 has a numerical value <32.
FILTER_FLAG_STRIP_HIGH FILTER_SANITIZE_ENCODED, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_SANITIZE_STRING, FILTER_UNSAFE_RAW Strips characters that has a numerical value >127.
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_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, 192.0.2.0/24 and 224.0.0.0/4. This flag does not apply to IPv6 addresses.
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.



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