PHP解密Unicode及Escape加密字符串函数

sxyzy

<?   
function uni_decode($s) {   
preg_match_all('/\&\#([0-9]{2,5})\;/', $s, $html_uni);   
preg_match_all('/[\\\%]u([0-9a-f]{4})/ie', $s, $js_uni);   
$source = array_merge($html_uni[0], $js_uni[0]);   
$js = array();   
for($i=0;$i<count($js_uni[1]);$i++) {   
$js[] = hexdec($js_uni[1][$i]);   
}   
$utf8 = array_merge($html_uni[1], $js);   
$code = $s;   
for($j=0;$j<count($utf8);$j++) {   
$code = str_replace($source[$j], unicode2utf8($utf8[$j]), $code);   
}   
return $code;//$s;//preg_replace('/\\\u([0-9a-f]{4})/ie', "chr(hexdec('\\1'))",  $s);   
}   
function unicode2utf8($c) {   
$str="";   
if ($c < 0x80) {   
$str.=chr($c);   
} else if ($c < 0x800) {   
$str.=chr(0xc0 | $c>>6);   
$str.=chr(0x80 | $c & 0x3f);   
} else if ($c < 0x10000) {   
$str.=chr(0xe0 | $c>>12);   
$str.=chr(0x80 | $c>>6 & 0x3f);   
$str.=chr(0x80 | $c & 0x3f);   
} else if ($c < 0x200000) {   
$str.=chr(0xf0 | $c>>18);   
$str.=chr(0x80 | $c>>12 & 0x3f);   
$str.=chr(0x80 | $c>>6 & 0x3f);   
$str.=chr(0x80 | $c & 0x3f);   
}   
return $str;   
}   
$str='%u5927%u5BB6%u597D%uFF0C<br />\u8FD9\u662F\u6D4B\u8BD5\u6587\u672C\uFF01';   
echo uni_decode($str); //   
?>