private function htmlEncode($data)
    {
        if (empty($data)) {
            return null;
        }

        $safeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890._-";

        $result = "";
        for ($i = 0; $i < strlen($data); $i++) {
            if (strstr($safeChars, $data[$i])) {
                $result .= $data[$i];
            } else if ("7F" >= $var = bin2hex(substr($data, $i, 1))) {
                $result .= "&#x" . $var . ";";
            } else {
                $result .= $data[$i];
            }
        }

        return $result;
    }
private function htmlEncode($data)
    {
        if (empty($data)) {
            return null;
        }

        $safeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890._-";

        $result = "";
        for ($i = 0; $i < strlen($data); $i++) {
            if (strstr($safeChars, $data[$i])) {
                $result .= $data[$i];
            } else if ("7F" >= $var = bin2hex(substr($data, $i, 1))) {
                $result .= "&#x" . $var . ";";
            } else {
                $result .= $data[$i];
            }
        }

        return $result;
    }
private function htmlEncode ( $ data ) { if ( empty ( $ data ) ) { return null ; } $ safeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890._-" ; $ result = "" ; for ( $ i = 0 ; $ i < strlen ( $ data ) ; $ i ++ ) { if ( strstr ( $ safeChars , $ data [ $ i ] ) ) { $ result .= $ data [ $ i ] ; } else if ( "7F" >= $ var = bin2hex ( substr ( $ data , $ i , 1 ) ) ) { $ result .= "&#x" . $ var . ";" ; } else { $ result .= $ data [ $ i ] ; } } return $ result ; }
Encode html string.

@param string $data

@return string
Encode html string .