| FILTER_SANITIZE_EMAIL | "email" |  |  | Remove all characters except letters, digits and
         !#$%&'*+-/=?^_`{|}~@.[]. | 
       
        | FILTER_SANITIZE_ENCODED | "encoded" |  | FILTER_FLAG_STRIP_LOW,
         FILTER_FLAG_STRIP_HIGH,
         FILTER_FLAG_ENCODE_LOW,
         FILTER_FLAG_ENCODE_HIGH | URL-encode string, optionally strip or encode special characters. | 
       
        | FILTER_SANITIZE_MAGIC_QUOTES | "magic_quotes" |  |  | Apply addslashes(). | 
       
        | FILTER_SANITIZE_NUMBER_FLOAT | "number_float" |  | FILTER_FLAG_ALLOW_FRACTION,
         FILTER_FLAG_ALLOW_THOUSAND,
         FILTER_FLAG_ALLOW_SCIENTIFIC | Remove all characters except digits, +- and
         optionally .,eE. | 
       
        | FILTER_SANITIZE_NUMBER_INT | "number_int" |  |  | Remove all characters except digits, plus and minus sign. | 
       
        | FILTER_SANITIZE_SPECIAL_CHARS | "special_chars" |  | FILTER_FLAG_STRIP_LOW,
         FILTER_FLAG_STRIP_HIGH,
         FILTER_FLAG_ENCODE_HIGH | HTML-escape '"<>& and characters with
         ASCII value less than 32, optionally strip or encode other special
         characters. | 
       
        | FILTER_SANITIZE_STRING | "string" |  | FILTER_FLAG_NO_ENCODE_QUOTES,
         FILTER_FLAG_STRIP_LOW,
         FILTER_FLAG_STRIP_HIGH,
         FILTER_FLAG_ENCODE_LOW,
         FILTER_FLAG_ENCODE_HIGH,
         FILTER_FLAG_ENCODE_AMP | Strip tags, optionally strip or encode special characters. | 
       
        | FILTER_SANITIZE_STRIPPED | "stripped" |  |  | Alias of "string" filter. | 
       
        | FILTER_SANITIZE_URL | "url" |  |  | Remove all characters except letters, digits and
         $-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=. | 
       
        | FILTER_UNSAFE_RAW | "unsafe_raw" |  | FILTER_FLAG_STRIP_LOW,
         FILTER_FLAG_STRIP_HIGH,
         FILTER_FLAG_ENCODE_LOW,
         FILTER_FLAG_ENCODE_HIGH,
         FILTER_FLAG_ENCODE_AMP | Do nothing, optionally strip or encode special characters. |