PHP Decode

--TEST--
HTML entities with invalid chars
--INI--
output_handler=
--FILE--
<?php
@setlocale (LC_CTYPE, "C");
$strings = array("<", "\xD0", "\xD0\x90", "\xD0\x90\xD0", "\xD0\x90\xD0\xB0", "\xE0", "A\xE0", "\xE0\x80", "\xE0\x79", "\xE0\x80\xBE",
    "Voil\xE0", "Clich\xE9s",
    "\xFE", "\xFE\x41", "\xC3\xA9", "\xC3\x79", "\xF7\xBF\xBF\xBF", "\xFB\xBF\xBF\xBF\xBF", "\xFD\xBF\xBF\xBF\xBF\xBF",
    "\x41\xF7\xF7\x42", "\x42\xFB\xFB\x42", "\x43\xFD\xFD\x42", "\x44\xF7\xF7", "\x45\xFB\xFB", "\x46\xFD\xFD"
    );
foreach($strings as $string) {
    $sc_encoded = htmlspecialchars ($string, ENT_QUOTES, "utf-8");
    var_dump(bin2hex($sc_encoded));
    $ent_encoded = htmlentities ($string, ENT_QUOTES, "utf-8");
    var_dump(bin2hex($ent_encoded));
}
?>
--EXPECT--
string(8) "266c743b"
string(8) "266c743b"
string(0) ""
string(0) ""
string(4) "d090"
string(4) "d090"
string(0) ""
string(0) ""
string(8) "d090d0b0"
string(8) "d090d0b0"
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(4) "c3a9"
string(16) "266561637574653b"
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""
string(0) ""