var_dump () JavaScript

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
     }
   }
}