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] => callback )