function var_dump () {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // +   improved by: Zahlii
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // -    depends on: echo
  // %        note 1: For returning a string, use var_export() with the second argument set to true
  // *     example 1: var_dump(1);
  // *     returns 1: 'int(1)'

  var output = '',
    pad_char = ' ',
    pad_val = 4,
    lgth = 0,
    i = 0,
    d = this.window.document;
  var _getFuncName = function (fn) {
    var name = (/\W*function\s+([\w\$]+)\s*\(/).exec(fn);
    if (!name) {
      return '(Anonymous)';
    }
    return name[1];
  };

  var _repeat_char = function (len, pad_char) {
    var str = '';
    for (var i = 0; i < len; i++) {
      str += pad_char;
    }
    return str;
  };
  var _getInnerVal = function (val, thick_pad) {
    var ret = '';
    if (val === null) {
      ret = 'NULL';
    } else if (typeof val === 'boolean') {
      ret = 'bool(' + val + ')';
    } else if (typeof val === 'string') {
      ret = 'string(' + val.length + ') "' + val + '"';
    } else if (typeof val === 'number') {
      if (parseFloat(val) == parseInt(val, 10)) {
        ret = 'int(' + val + ')';
      } else {
        ret = 'float(' + val + ')';
      }
    }
    // The remaining are not PHP behavior because these values only exist in this exact form in JavaScript
    else if (typeof val === 'undefined') {
      ret = 'undefined';
    } else if (typeof val === 'function') {
      var funcLines = val.toString().split('\n');
      ret = '';
      for (var i = 0, fll = funcLines.length; i < fll; i++) {
        ret += (i !== 0 ? '\n' + thick_pad : '') + funcLines[i];
      }
    } else if (val instanceof Date) {
      ret = 'Date(' + val + ')';
    } else if (val instanceof RegExp) {
      ret = 'RegExp(' + val + ')';
    } else if (val.nodeName) { // Different than PHP's DOMElement
      switch (val.nodeType) {
      case 1:
        if (typeof val.namespaceURI === 'undefined' || val.namespaceURI === 'http://www.w3.org/1999/xhtml') { // Undefined namespace could be plain XML, but namespaceURI not widely supported
          ret = 'HTMLElement("' + val.nodeName + '")';
        } else {
          ret = 'XML Element("' + val.nodeName + '")';
        }
        break;
      case 2:
        ret = 'ATTRIBUTE_NODE(' + val.nodeName + ')';
        break;
      case 3:
        ret = 'TEXT_NODE(' + val.nodeValue + ')';
        break;
      case 4:
        ret = 'CDATA_SECTION_NODE(' + val.nodeValue + ')';
        break;
      case 5:
        ret = 'ENTITY_REFERENCE_NODE';
        break;
      case 6:
        ret = 'ENTITY_NODE';
        break;
      case 7:
        ret = 'PROCESSING_INSTRUCTION_NODE(' + val.nodeName + ':' + val.nodeValue + ')';
        break;
      case 8:
        ret = 'COMMENT_NODE(' + val.nodeValue + ')';
        break;
      case 9:
        ret = 'DOCUMENT_NODE';
        break;
      case 10:
        ret = 'DOCUMENT_TYPE_NODE';
        break;
      case 11:
        ret = 'DOCUMENT_FRAGMENT_NODE';
        break;
      case 12:
        ret = 'NOTATION_NODE';
        break;
      }
    }
    return ret;
  };

  var _formatArray = function (obj, cur_depth, pad_val, pad_char) {
    var someProp = '';
    if (cur_depth > 0) {
      cur_depth++;
    }

    var base_pad = _repeat_char(pad_val * (cur_depth - 1), pad_char);
    var thick_pad = _repeat_char(pad_val * (cur_depth + 1), pad_char);
    var str = '';
    var val = '';

    if (typeof obj === 'object' && obj !== null) {
      if (obj.constructor && _getFuncName(obj.constructor) === 'PHPJS_Resource') {
        return obj.var_dump();
      }
      lgth = 0;
      for (someProp in obj) {
        lgth++;
      }
      str += 'array(' + lgth + ') {\n';
      for (var key in obj) {
        var objVal = obj[key];
        if (typeof objVal === 'object' && objVal !== null && !(objVal instanceof Date) && !(objVal instanceof RegExp) && !objVal.nodeName) {
          str += thick_pad + '[' + key + '] =>\n' + thick_pad + _formatArray(objVal, cur_depth + 1, pad_val, pad_char);
        } else {
          val = _getInnerVal(objVal, thick_pad);
          str += thick_pad + '[' + key + '] =>\n' + thick_pad + val + '\n';
        }
      }
      str += base_pad + '}\n';
    } else {
      str = _getInnerVal(obj, thick_pad);
    }
    return str;
  };

  output = _formatArray(arguments[0], 0, pad_val, pad_char);
  for (i = 1; i < arguments.length; i++) {
    output += '\n' + _formatArray(arguments[i], 0, pad_val, pad_char);
  }

  if (d.body) {
    this.echo(output);
  } else {
    try {
      d = XULDocument; // We're in XUL, so appending as plain text won't work
      this.echo('<pre xmlns="http://www.w3.org/1999/xhtml" style="white-space:pre;">' + output + '</pre>');
    } catch (e) {
      this.echo(output); // Outputting as plain text may work in some plain XML
    }
  }
}

var_dump(1);

'int(1)'