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Predefined Constants
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
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INPUT_POST
(int)
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POST variables.
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INPUT_GET
(int)
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GET variables.
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INPUT_COOKIE
(int)
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COOKIE variables.
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INPUT_ENV
(int)
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ENV variables.
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INPUT_SERVER
(int)
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SERVER variables.
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INPUT_SESSION
(int)
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SESSION variables.
(Removed as of PHP 8.0.0; was not implemented previously)
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INPUT_REQUEST
(int)
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REQUEST variables.
(Removed as of PHP 8.0.0; was not implemented previously)
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FILTER_FLAG_NONE
(int)
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No flags.
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FILTER_REQUIRE_SCALAR
(int)
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Flag used to require scalar as input
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FILTER_REQUIRE_ARRAY
(int)
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Require an array as input.
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FILTER_FORCE_ARRAY
(int)
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Always returns an array.
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FILTER_NULL_ON_FAILURE
(int)
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Use NULL instead of FALSE on failure.
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FILTER_VALIDATE_INT
(int)
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ID of "int" filter.
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FILTER_VALIDATE_BOOL
(int)
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Alias of
FILTER_VALIDATE_BOOLEAN .
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FILTER_VALIDATE_BOOLEAN
(int)
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ID of "boolean" filter.
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FILTER_VALIDATE_FLOAT
(int)
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ID of "float" filter.
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FILTER_VALIDATE_REGEXP
(int)
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ID of "validate_regexp" filter.
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FILTER_VALIDATE_URL
(int)
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ID of "validate_url" filter.
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FILTER_VALIDATE_DOMAIN
(int)
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ID of "validate_domain" filter.
(Available as of PHP 7.0.0)
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FILTER_VALIDATE_EMAIL
(int)
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ID of "validate_email" filter.
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FILTER_VALIDATE_IP
(int)
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ID of "validate_ip" filter.
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FILTER_VALIDATE_MAC
(int)
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ID of "validate_mac_address" filter.
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FILTER_DEFAULT
(int)
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ID of default ("unsafe_raw") filter. This is equivalent to
FILTER_UNSAFE_RAW .
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FILTER_UNSAFE_RAW
(int)
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ID of "unsafe_raw" filter.
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FILTER_SANITIZE_STRING
(int)
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ID of "string" filter.
(Deprecated as of PHP 8.1.0,
use htmlspecialchars instead.)
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FILTER_SANITIZE_STRIPPED
(int)
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ID of "stripped" filter.
(Deprecated as of PHP 8.1.0,
use htmlspecialchars instead.)
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FILTER_SANITIZE_ENCODED
(int)
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ID of "encoded" filter.
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FILTER_SANITIZE_SPECIAL_CHARS
(int)
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ID of "special_chars" filter.
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FILTER_SANITIZE_FULL_SPECIAL_CHARS
(int)
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ID of "full_special_chars" filter.
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FILTER_SANITIZE_EMAIL
(int)
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ID of "email" filter.
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FILTER_SANITIZE_URL
(int)
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ID of "url" filter.
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FILTER_SANITIZE_NUMBER_INT
(int)
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ID of "number_int" filter.
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FILTER_SANITIZE_NUMBER_FLOAT
(int)
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ID of "number_float" filter.
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FILTER_SANITIZE_MAGIC_QUOTES
(int)
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ID of "magic_quotes" filter.
(DEPRECATED as of PHP 7.3.0 and
REMOVED as of PHP 8.0.0,
use
FILTER_SANITIZE_ADD_SLASHES instead.)
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FILTER_SANITIZE_ADD_SLASHES
(int)
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ID of "add_slashes" filter.
(Available as of PHP 7.3.0)
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FILTER_CALLBACK
(int)
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ID of "callback" filter.
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FILTER_FLAG_ALLOW_OCTAL
(int)
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Allow octal notation (
0[0-7]+ ) in "int" filter.
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FILTER_FLAG_ALLOW_HEX
(int)
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Allow hex notation (
0x[0-9a-fA-F]+ ) in "int" filter.
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FILTER_FLAG_STRIP_LOW
(int)
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Strip characters with ASCII value less than 32.
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FILTER_FLAG_STRIP_HIGH
(int)
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Strip characters with ASCII value greater than 127.
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FILTER_FLAG_STRIP_BACKTICK
(int)
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Strips backtick characters.
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FILTER_FLAG_ENCODE_LOW
(int)
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Encode characters with ASCII value less than 32.
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FILTER_FLAG_ENCODE_HIGH
(int)
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Encode characters with ASCII value greater than 127.
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FILTER_FLAG_ENCODE_AMP
(int)
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Encode
& .
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FILTER_FLAG_NO_ENCODE_QUOTES
(int)
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Don't encode
' and " .
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FILTER_FLAG_EMPTY_STRING_NULL
(int)
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(No use for now.)
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FILTER_FLAG_ALLOW_FRACTION
(int)
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Allow fractional part in "number_float" filter.
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FILTER_FLAG_ALLOW_THOUSAND
(int)
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Allow thousand separator (
, ) in "number_float" filter.
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FILTER_FLAG_ALLOW_SCIENTIFIC
(int)
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Allow scientific notation (
e , E ) in
"number_float" filter.
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FILTER_FLAG_PATH_REQUIRED
(int)
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Require path in "validate_url" filter.
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FILTER_FLAG_QUERY_REQUIRED
(int)
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Require query in "validate_url" filter.
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FILTER_FLAG_SCHEME_REQUIRED
(int)
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Require scheme in "validate_url" filter.
(Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied in the filter already.)
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FILTER_FLAG_HOST_REQUIRED
(int)
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Require host in "validate_url" filter.
(Deprecated as of PHP 7.3.0 and removed as of PHP 8.0.0, as it is implied in the filter already.)
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FILTER_FLAG_HOSTNAME
(int)
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Require hostnames to start with an alphanumeric character and contain
only alphanumerics or hyphens.
(Available as of PHP 7.0.0)
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FILTER_FLAG_IPV4
(int)
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Allow only IPv4 address in "validate_ip" filter.
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FILTER_FLAG_IPV6
(int)
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Allow only IPv6 address in "validate_ip" filter.
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FILTER_FLAG_NO_RES_RANGE
(int)
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Deny reserved addresses in "validate_ip" filter.
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FILTER_FLAG_NO_PRIV_RANGE
(int)
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Deny private addresses in "validate_ip" filter.
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FILTER_FLAG_GLOBAL_RANGE
(int)
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Only allow global addresses (per RFC 6890) in "validate_ip" filter.
(Available as of PHP 8.2.0)
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FILTER_FLAG_EMAIL_UNICODE
(int)
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Accepts Unicode characters in the local part in "validate_email" filter.
(Available as of PHP 7.1.0)
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