PHP解密Unicode及Escape加密字符串函数

<?  
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 < 0×80) {  
         $str.=chr($c);  
    } else if ($c < 0×800) {  
         $str.=chr(0xc0 | $c>>6);  
         $str.=chr(0×80 | $c & 0x3f);  
    } else if ($c < 0×10000) {  
         $str.=chr(0xe0 | $c>>12);  
         $str.=chr(0×80 | $c>>6 & 0x3f);  
         $str.=chr(0×80 | $c & 0x3f);  
    } else if ($c < 0×200000) {  
         $str.=chr(0xf0 | $c>>18);  
         $str.=chr(0×80 | $c>>12 & 0x3f);  
         $str.=chr(0×80 | $c>>6 & 0x3f);  
         $str.=chr(0×80 | $c & 0x3f);  
    }  
    return $str;  
}  
 
$str=”%u5927%u5BB6%u597D%uFF0Cbr />\u8FD9\u662F\u6D4B\u8BD5\u6587\u672C\uFF01″;  
echo uni_decode($str); // 大家好
?>