| 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. |