FILTER_VALIDATE_BOOLEAN

Returns TRUE for "1", "true", "on" and "yes". Returns FALSE otherwise.

FILTER_VALIDATE_EMAIL

Validates value as e-mail.

FILTER_VALIDATE_FLOAT

Validates value as float.

FILTER_VALIDATE_INT

Validates value as integer optionally from the specified range.

FILTER_VALIDATE_IP

Validates value as IP address, optionally only IPv4 or IPv6 or not from private or reserved ranges.

FILTER_VALIDATE_REGEXP

Validates value against regexp, a Perl-compatible regular expression.

FILTER_VALIDATE_URL

Validates value as URL, optionally with required components.