Filter flags

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**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_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.

用户评论:

[#1] bohwaz [2012-02-06 00:52:16]

Please note that FILTER_FLAG_HOST_REQUIRED and FILTER_FLAG_SCHEME_REQUIRED have disappeared. They were previously mentioned in the constants page but it seems that host and scheme are now required by default for the validate_url filter.

[#2] php dot net at ewood dot users dot cementhorizon dot com [2010-10-19 16:42:13]

In order to filter on loopback addresses try this :

<?php function FILTER_FLAG_NO_LOOPBACK_RANGE($value) { // Fails validation for the following loopback IPv4 range: 127.0.0.0/8 // This flag does not apply to IPv6 addresses return filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) ? $value : (((ip2long($value) & 0xff000000) == 0x7f000000) ? FALSE : $value); } $var = filter_var('127.0.0.1', FILTER_CALLBACK, array('options' => 'FILTER_FLAG_NO_LOOPBACK_RANGE')); // Returns FALSE $var = filter_var('74.125.19.103', FILTER_CALLBACK, array('options' => 'FILTER_FLAG_NO_LOOPBACK_RANGE')); // Returns '74.125.19.103' // To filter Private IP ranges and Loopback ranges $var = filter_var('127.0.0.1', FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE) && filter_var('127.0.0.1', FILTER_CALLBACK, array('options' => 'FILTER_FLAG_NO_LOOPBACK_RANGE')); // Returns FALSE ?>

(If someone wants to write in handling for the IPv6 loopback interface at "::1" go for it.)

-Gene Wood