| 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_STRIP_BACKTICK,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_STRIP_BACKTICK,FILTER_FLAG_ENCODE_HIGH | HTML-escape '"<>& and characters with
         ASCII value less than 32, optionally strip or encode other special
         characters. | 
       
        | FILTER_SANITIZE_FULL_SPECIAL_CHARS | "full_special_chars" | FILTER_FLAG_NO_ENCODE_QUOTES, | Equivalent to calling htmlspecialchars with ENT_QUOTESset. Encoding quotes can
         be disabled by settingFILTER_FLAG_NO_ENCODE_QUOTES. Like htmlspecialchars, this
         filter is aware of the default_charset and if a sequence of bytes is detected that
         makes up an invalid character in the current character set then the entire string is rejected resulting in a 0-length string.
         When using this filter as a default filter, see the warning below about setting the default flags to 0. | 
       
        | FILTER_SANITIZE_STRING | "string" | FILTER_FLAG_NO_ENCODE_QUOTES,FILTER_FLAG_STRIP_LOW,FILTER_FLAG_STRIP_HIGH,FILTER_FLAG_STRIP_BACKTICK,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_STRIP_BACKTICK,FILTER_FLAG_ENCODE_LOW,FILTER_FLAG_ENCODE_HIGH,FILTER_FLAG_ENCODE_AMP | Do nothing, optionally strip or encode special characters. This
         filter is also aliased to FILTER_DEFAULT. |