PHP解密Unicode及Escape加密字符串

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<?php

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我是孤魂！<br />\u8FD9\u662F\u6D4B\u8BD5\u6587\u672C\uFF01';

echo uni_decode($str); // 大家好，我是孤魂！这是测试文本！

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function phpescape($str){

preg_match_all("/[\x80-\xff].|[\x01-\x7f]+/",$str,$newstr);

$ar = $newstr[0];

foreach($ar as $k=>$v){

if(ord($ar[$k])>=127){

$tmpString=bin2hex(iconv("GBK","ucs-2",$v));

if (!eregi("WIN",PHP_OS)){

$tmpString = substr($tmpString,2,2).substr($tmpString,0,2);

}

$reString.="%u".$tmpString;

} else {

$reString.= rawurlencode($v);

}

}

return $reString;

}