PHP_PHPチュートリアルでのエスケープデコード関数の実装方法

function unescape($str) {
$str = rawurldecode($str);
preg_match_all("/%u.{4}|& #x. {4};|d+;|.+/U",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
if (substr($v,0,2) == "%u")
$ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v) ,-4 )));
elseif(substr($v,0,3) == "")
$ar[$k] = iconv("UCS-2","GBK",pack(") H4", substr($v,3,-1)));
elseif(substr($v,0,2) == "") {
$ar[$k] = iconv("UCS-2 "," GBK",pack("n",substr($v,2,-1)));
}
}
return join("",$ar);
}

function unescape($str){
$ret = '';
$len = strlen($str); ; $len; $i++ ){
if ($str[$i] == '%' && $str[$i+1] == 'u'){
$val = hexdec($str, $ i+2, 4) );
if ($val else if($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]
}
$ret;



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