FILTER_LIST
Returns a list of all supported filters
SYNTAX
filter_list ( void ) : array
RETURN
Returns an array of names of all supported filters, empty array if there are no such filters. Indexes of this array are not filter IDs, they can be obtained with filter_id() from a name instead.
EXAMPLES
Array
(
[0] => int
[1] => boolean
[2] => float
[3] => validate_regexp
[4] => validate_domain
[5] => validate_url
[6] => validate_email
[7] => validate_ip
[8] => validate_mac
[9] => string
[10] => stripped
[11] => encoded
[12] => special_chars
[13] => full_special_chars
[14] => unsafe_raw
[15] => email
[16] => url
[17] => number_int
[18] => number_float
[19] => magic_quotes
[20] => add_slashes
[21] => callback
)