| ID | Name | Options | Flags | Description | 
|---|---|---|---|---|
| FILTER_VALIDATE_BOOLEAN | "boolean" | default | FILTER_NULL_ON_FAILURE | 
          Returns  
          If  | 
| FILTER_VALIDATE_EMAIL | "validate_email" | default | Validates whether the value is a valid e-mail address. In general, this validates e-mail addresses against the syntax in RFC 822, with the exceptions that comments and whitespace folding are not supported. | |
| FILTER_VALIDATE_FLOAT | "float" | default,decimal | FILTER_FLAG_ALLOW_THOUSAND | Validates value as float, and converts to float on success. | 
| 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, and converts to int on success. | 
| 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_MAC | "validate_mac_address" | default | Validates value as MAC address. | |
| 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_FLOATandFILTER_VALIDATE_INT). Before PHP 5.4.11 they only validated as floats (usingFILTER_VALIDATE_FLOAT).When
defaultis set to option,default's value is used if value is not validated.
| Version | Description | 
|---|---|
| 5.5.0 | Added FILTER_VALIDATE_MAC |