js function php custom function example of method to implement JS escape

The example in this article describes how to implement JS escape using PHP custom functions. Share it with everyone for your reference, the details are as follows:

//php function
function escape($string) {
    $n = $bn = $tn = 0;
    $output = '';
    $special = "-_.+@/*0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    while($n < strlen($string)) {
        $ascii = ord($string[$n]);
        if($ascii == 9 || $ascii == 10 || (32 <= $ascii && $ascii <= 126)) {
            $tn = 1;$n++;
        } elseif(194 <= $ascii && $ascii <= 223) {
            $tn = 2;$n += 2;
        } elseif(224 <= $ascii && $ascii <= 239) {
            $tn = 3;$n += 3;
        } elseif(240 <= $ascii && $ascii <= 247) {
            $tn = 4;$n += 4;
        } elseif(248 <= $ascii && $ascii <= 251) {
            $tn = 5;$n += 5;
        } elseif($ascii == 252 || $ascii == 253) {
            $tn = 6;$n += 6;
        } else {
            $n++;
        }
        $singleStr = substr($string,$bn,$tn);
        $charVal = bin2hex(iconv('utf-8', 'ucs-2', $singleStr));
        if(base_convert($charVal, 16, 10) > 0xff) {
           if (!preg_match("/win/i", PHP_OS))
            $charVal = substr($charVal, 2, 2).substr($charVal, 0, 2);
          $output .= '%u' . $charVal;
        }
        else {
            if(false !== strpos($special, $singleStr))
               $output .= $singleStr;
            else
               $output .="%" . dechex(ord($string[$bn]));
        }
     $bn = $n;
    }
    return $output;
}

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