--TEST--
filter_var() and FILTER_SANITIZE_SPECIAL_CHARS
--SKIPIF--
<?php if (!extension_loaded("filter")) die("skip"); ?>
--FILE--
<?php

var_dump(filter_var("?><!@#$%^&*()}{~Qwertyuilfdsasdfgmnbvcxcvbn", FILTER_SANITIZE_SPECIAL_CHARS));
var_dump(filter_var("<data&sons>", FILTER_SANITIZE_SPECIAL_CHARS));
var_dump(filter_var("", FILTER_SANITIZE_SPECIAL_CHARS));

var_dump(filter_var("?><!@#$%^&*()}{~Qwertyuilfdsasdfgmnbvcxcvbn", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_LOW));
var_dump(filter_var("<data&sons>", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_LOW));
var_dump(filter_var("", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_LOW));

var_dump(filter_var("?><!@#$%^&*()}{~Qwertyuilfdsasdfgmnbvcxcvbn", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_HIGH));
var_dump(filter_var("<data&sons>", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_HIGH));
var_dump(filter_var("", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_HIGH));

var_dump(filter_var("кириллица", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_HIGH));
var_dump(filter_var("кириллица", FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_ENCODE_LOW));

echo "Done\n";
?>
--EXPECT--    
string(55) "?&#62;&#60;!@#$%^&#38;*()}{~Qwertyuilfdsasdfgmnbvcxcvbn"
string(23) "&#60;data&#38;sons&#62;"
string(0) ""
string(55) "?&#62;&#60;!@#$%^&#38;*()}{~Qwertyuilfdsasdfgmnbvcxcvbn"
string(23) "&#60;data&#38;sons&#62;"
string(0) ""
string(55) "?&#62;&#60;!@#$%^&#38;*()}{~Qwertyuilfdsasdfgmnbvcxcvbn"
string(23) "&#60;data&#38;sons&#62;"
string(0) ""
string(108) "&#208;&#186;&#208;&#184;&#209;&#128;&#208;&#184;&#208;&#187;&#208;&#187;&#208;&#184;&#209;&#134;&#208;&#176;"
string(18) "кириллица"
Done