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Checking Filters

filter_list() returns an array of the names of all supported filters. filter_id($s) returns the filter ID belonging to a filter named $s. 

<!DOCTYPE html><html><head></head>
<body><?php

print_r(filter_list());
echo "<br /><br />";
$f=filter_id("validate_email");
var_dump(filter_var("hello@yahoo.com",$f));

?></body></html>

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] => full_special_chars [12] => unsafe_raw [13] => email [14] => url [15] => number_int [16] => number_float [17] => magic_quotes [18] => callback )

string(15) "hello@yahoo.com"