Validate filters

Listing of filters for validation

ID	Name	Options	Flags	Description
FILTER_VALIDATE_BOOLEAN	"boolean"	default	FILTER_NULL_ON_FAILURE	Returns TRUE for "1", "true", "on" and "yes". Returns FALSE otherwise. If FILTER_NULL_ON_FAILURE is set, FALSE is returned only for "0", "false", "off", "no", and "", and NULL is returned for all non-boolean values.
FILTER_VALIDATE_EMAIL	"validate_email"	default		Validates value as e-mail.
FILTER_VALIDATE_FLOAT	"float"	default, decimal	FILTER_FLAG_ALLOW_THOUSAND	Validates value as float.
FILTER_VALIDATE_INT	"int"	default, min_range, max_range	FILTER_FLAG_ALLOW_OCTAL, FILTER_FLAG_ALLOW_HEX	Validates value as integer, optionally from the specified range.
FILTER_VALIDATE_IP	"validate_ip"	default	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_VALIDATE_REGEXP	"validate_regexp"	default, regexp		Validates value against regexp, a Perl-compatible regular expression.
FILTER_VALIDATE_URL	"validate_url"	default	FILTER_FLAG_PATH_REQUIRED, FILTER_FLAG_QUERY_REQUIRED	Validates value as URL (according to » http://www.faqs.org/rfcs/rfc2396), optionally with required components. Beware a valid URL may not specify the HTTP protocol http:// so further validation may be required to determine the URL uses an expected protocol, e.g. ssh:// or mailto:. Note that the function will only find ASCII URLs to be valid; internationalized domain names (containing non-ASCII characters) will fail.

Note:

As of PHP 5.4.11, the numbers +0 and -0 validate as both integers as well as floats (using FILTER_VALIDATE_FLOAT and FILTER_VALIDATE_INT). Before PHP 5.4.11 they only validated as floats (using FILTER_VALIDATE_FLOAT).

When default is set to option, default's value is used if value is not validated.