| ID | Name | Options | Flags | Description |
|---|---|---|---|---|
| FILTER_VALIDATE_BOOLEAN | "boolean" | 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" | Validates value as e-mail. | ||
| FILTER_VALIDATE_FLOAT | "float" | decimal | FILTER_FLAG_ALLOW_THOUSAND | Validates value as float. |
| 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_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_VALIDATE_REGEXP | "validate_regexp" | regexp | Validates value against regexp, a Perl-compatible regular expression. | |
| FILTER_VALIDATE_URL | "validate_url" | FILTER_FLAG_PATH_REQUIRED, FILTER_FLAG_QUERY_REQUIRED | Validates value as URL, optionally with required components. |
Note: Numbers +0 and -0 are not valid integers but validate as floats.