How js and php handle url encoding

Solution: js is used to encode escape characters in URL.

<a href="" onclick="window.open('product_list.php?p_sort='+escape('PHP Development Resource Network '));">

The effect of clicking a link like this:

Reference: http: / / 127.0.0.1 shop/product_list php? p_sort=PHP%u5F00%u53D1%u8D44%u6E90%u7F51

With this effect, it is obvious that it cannot be solved inversely with urldecode() or base64_decode() of PHP.

To solve this problem, write an inverse function using PHP:

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;
}

Note that the JS code is automatically converted to UTF-8, so the code conversion must be done to get the correct result, otherwise the Chinese code will be garbled.

print iconv('utf-8', 'gb2312', js_unescape($_REQUEST['p_sort']));

At this point, we have successfully reversed the escape encoding of js.

I also found a function that uses PHP to implement escape encoding of js:

function phpescape($str){
$sublen=strlen($str);
$retrunString="";
for ($i=0;$i<$sublen;$i++){
if(ord($str[$i])>=127){
$tmpString=bin2hex(iconv("gb2312","ucs-2",substr($str,$i,2)));
        //$tmpString=substr($tmpString,2,2).substr($tmpString,0,2);window You may want to open this item 
$retrunString.="%u".$tmpString;
$i++;
} else {
        $retrunString.="%".dechex(ord($str[$i]));
}}
return $retrunString;
}