XLI. Filter Functions

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This extension serves for validating and filtering data coming usually from some insecure source such as user input.

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The following filters currently exist, be sure to read the Filter Constants section for information that describes the behavior of each constant:

表格 1. Existing filters

IDNameOptionsFlagsDescription
FILTER_VALIDATE_INT"int" min_range, max_range FILTER_FLAG_ALLOW_OCTAL, FILTER_FLAG_ALLOW_HEX Validates value as integer, optionally from the specified range.
FILTER_VALIDATE_BOOLEAN"boolean"   Returns TRUE for "1", "true", "on" and "yes", FALSE for "0", "false", "off", "no", and "", NULL otherwise.
FILTER_VALIDATE_FLOAT"float"  Validates value as float.
FILTER_VALIDATE_REGEXP"validate_regexp" regexp   Validates value against regexp, a Perl-compatible regular expression.
FILTER_VALIDATE_URL"validate_url"  FILTER_FLAG_SCHEME_REQUIRED, FILTER_FLAG_HOST_REQUIRED, FILTER_FLAG_PATH_REQUIRED, FILTER_FLAG_QUERY_REQUIRED Validates value as URL, optionally with required components.
FILTER_VALIDATE_EMAIL"validate_email"  Validates value as e-mail.
FILTER_VALIDATE_IP"validate_ip"  FILTER_FLAG_IPV4, FILTER_FLAG_IPV6, FILTER_FLAG_NO_PRIV_RANGE, FILTER_FLAG_NO_RES_RANGE Validates value as IP address, optionally only IPv4 or IPv6 or not from private or reserved ranges.
FILTER_SANITIZE_STRING"string"  FILTER_FLAG_NO_ENCODE_QUOTES, FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH, FILTER_FLAG_ENCODE_AMP Strip tags, optionally strip or encode special characters.
FILTER_SANITIZE_STRIPPED"stripped"  Alias of "string" filter.
FILTER_SANITIZE_ENCODED"encoded"  FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH URL-encode string, optionally strip or encode special characters.
FILTER_SANITIZE_SPECIAL_CHARS"special_chars"  FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_ENCODE_HIGH HTML-escape '"<>& and characters with ASCII value less than 32, optionally strip or encode other special characters.
FILTER_UNSAFE_RAW"unsafe_raw"  FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH, FILTER_FLAG_ENCODE_AMP Do nothing, optionally strip or encode special characters.
FILTER_SANITIZE_EMAIL"email"   Remove all characters except letters, digits and !#$%&'*+-/=?^_`{|}~@.[].
FILTER_SANITIZE_URL"url"   Remove all characters except letters, digits and $-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=.
FILTER_SANITIZE_NUMBER_INT"number_int"   Remove all characters except digits and +-.
FILTER_SANITIZE_NUMBER_FLOAT"number_float"  FILTER_FLAG_ALLOW_FRACTION, FILTER_FLAG_ALLOW_THOUSAND, FILTER_FLAG_ALLOW_SCIENTIFIC Remove all characters except digits, +- and optionally .,eE.
FILTER_SANITIZE_MAGIC_QUOTES"magic_quotes"  Apply addslashes().
FILTER_CALLBACK"callback" callback function or methodCall user-defined function to filter data.

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A short installation note: just type
$ pear install filter
in your console.

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表格 2. Filter Configuration Options

NameDefaultChangeableChangelog
filter.defaultunsafe_rawPHP_INI_PERDIR 
filter.default_flags PHP_INI_PERDIR 
For further details and definitions of the PHP_INI_* constants, see the 附錄 G.

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filter.default string

Filter all $_GET, $_POST, $_COOKIE and $_REQUEST data by this filter. Original data can be accessed through input_get().

filter.default_flags integer

Default flags for filter_data().

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INPUT_POST (integer)

POST variables.

INPUT_GET (integer)

GET variables.

INPUT_COOKIE (integer)

COOKIE variables.

INPUT_ENV (integer)

ENV variables.

INPUT_SERVER (integer)

SERVER variables.

INPUT_SESSION (integer)

SESSION variables.

INPUT_DATA (integer)

User-defined set of variables.

FILTER_FLAG_NONE (integer)

No flags.

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_SCALAR (integer)

Allow scalar types (non-array) only in filter. Currently used by input_get_args().

FILTER_FLAG_ARRAY (integer)

Only allow array type in filter. Currently used by input_get_args().

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_SCHEME_REQUIRED (integer)

Require scheme in "validate_url" filter.

FILTER_FLAG_HOST_REQUIRED (integer)

Require host in "validate_url" 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.

內容目錄
filter_data -- Filters data with a specified filter
input_filters_list -- Returns a list of all supported filters
input_get_args -- Gets multiple variables from outside PHP and optionally filters them
input_get -- Gets variable from outside PHP and optionally filters it
input_has_variable -- Checks if variable of specified type exists
input_name_to_filter -- Returns the filter ID belonging to a named filter