提示和说明 注：此结果并不功能的过滤器编号，但过滤器的名称。使用filter_id （ ）函数来得到过滤器编号

例如

输出结果.

Array ( [0] => int [1] => boolean [2] => float [3] => validate_regexp [4] => validate_url [5] => validate_email [6] => validate_ip [7] => string [8] => stripped [9] => encoded [10] => special_chars [11] => unsafe_raw [12] => email [13] => url [14] => number_int [15] => number_float [16] => magic_quotes [17] => callback )