function htmlspecialchars (string, quote_style, charset, double_encode) {
    // Convert special characters to HTML entities  
    // 
    // version: 912.1315
    // discuss at: http://phpjs.org/functions/htmlspecialchars    // +   original by: Mirek Slugen
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Nathan
    // +   bugfixed by: Arno
    // +    revised by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)    // +    bugfixed by: Brett Zamir (http://brett-zamir.me)
    // +      input by: Ratheous
    // +      input by: Mailfaker (http://www.weedem.fr/)
    // +      reimplemented by: Brett Zamir (http://brett-zamir.me)
    // +      input by: felix    // +    bugfixed by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: charset argument not supported
    // *     example 1: htmlspecialchars("<a href='test'>Test</a>", 'ENT_QUOTES');
    // *     returns 1: '&lt;a href=&#039;test&#039;&gt;Test&lt;/a&gt;'
    // *     example 2: htmlspecialchars("ab\"c'd", ['ENT_NOQUOTES', 'ENT_QUOTES']);    // *     returns 2: 'ab"c&#039;d'
    // *     example 3: htmlspecialchars("my "&entity;" is still here", null, null, false);
    // *     returns 3: 'my &quot;&entity;&quot; is still here'
    var optTemp = 0, i = 0, noquotes= false;
    if (typeof quote_style === 'undefined' || quote_style === null) {        quote_style = 2;
    }
    string = string.toString();
    if (double_encode !== false) { // Put this first to avoid double-encoding
        string = string.replace(/&/g, '&amp;');    }
    string = string.replace(/</g, '&lt;').replace(/>/g, '&gt;');
 
    var OPTS = {
        'ENT_NOQUOTES': 0,
        'ENT_HTML_QUOTE_SINGLE' : 1,
        'ENT_HTML_QUOTE_DOUBLE' : 2,
        'ENT_COMPAT': 2,
        'ENT_QUOTES': 3,
        'ENT_IGNORE' : 4    };
    if (quote_style === 0) {
        noquotes = true;
    }
    if (typeof quote_style !== 'number') { // Allow for a single string or an array of string flags        quote_style = [].concat(quote_style);
        for (i=0; i < quote_style.length; i++) {
            // Resolve string input to bitwise e.g. 'PATHINFO_EXTENSION' becomes 4
            if (OPTS[quote_style[i]] === 0) {
                noquotes = true;            }
            else if (OPTS[quote_style[i]]) {
                optTemp = optTemp | OPTS[quote_style[i]];
            }
        }        quote_style = optTemp;
    }
    if (quote_style & OPTS.ENT_HTML_QUOTE_SINGLE) {
        string = string.replace(/'/g, '&#039;');
    }    if (!noquotes) {
        string = string.replace(/"/g, '&quot;');
    }
 
    return string;
}

function var_dump(obj)
{
   if(typeof obj == "object") {
      return "Type: "+typeof(obj)+((obj.constructor) ? "\nConstructor: "+obj.constructor : "")+"\nValue: " + obj;
   } else {
      return "Type: "+typeof(obj)+"\nValue: "+obj;
   }
}

function nl2br(text)
{
    return text.replace(/\n/g,'<br />');
}

function sendHttpGetRequest(url)
{
    var request = new XMLHttpRequest();
    request.open("GET", url, false);
    
    request.send(null);
    
    return request.responseText;
}

function sendHttpPostRequest(url, text)
{
    var request = new XMLHttpRequest();
    request.open("POST", url, false);
    
    request.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
    request.setRequestHeader("Content-length", text.length);
    request.setRequestHeader("Connection", "close");
    
    request.send(text);
}