php 里实现 javascript 里的unescape函数

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function js_unescape($str)
{
$ret = '';
$len = strlen($str);
for ($i = 0; $i < $len; $i++)
{
if ($str[$i] == '%' && $str[$i+1] == 'u')
{
$val = hexdec(substr($str, $i+2, 4));
if ($val < 0x7f) $ret .= chr($val);
else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f));
else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f));
$i += 5;
}
else if ($str[$i] == '%')
{
$ret .= urldecode(substr($str, $i, 3));
$i += 2;
}
else $ret .= $str[$i];
}
return $ret;
}



function phpEscape($str,$encode="utf-8") {
if ($encode=="" && !(function_exists("mb_detect_encoding"))) {
echo "error You must enter the string's encoding or extend the php for mb_string";
return ;
}
elseif($encode=="") {
echo "Use mb_string function to detect the string's encoding <br/>";
$encode = mb_detect_encoding($str);
}
preg_match_all("/[\xC0-\xE0].|[\xE0-\xF0]..|[\x01-\x7f]+/",$str,$r);
//prt($r);
$ar = $r[0];
foreach($ar as $k=>$v) {
$ord = ord($v[0]);
if( $ord<=0x7F)
$ar[$k] = rawurlencode($v);
elseif ($ord<0xE0) {
$ar[$k] = "%u".bin2hex(iconv($encode,"UCS-2",$v));
}
elseif ($ord<0xF0) {
$ar[$k] = "%u".bin2hex(iconv($encode,"UCS-2",$v));
}
}//foreach
return join("",$ar);
}