print_r() do PHP no Javascript

gistfile1.js

/**
* JavaScript print_r
*
* PHP print JavaScript version
*
* @package       print_r
* @author        Bruno Augusto
* @version       0.1
*
* @params        string Input
* @return        string Output
*/
function print_r( input, _indent ) {
// Recuo

var indent = ( typeof( _indent ) == 'string' ) ? _indent + '    ' : '    '
var parent_indent = ( typeof( _indent ) == 'string' ) ? _indent : '';
var output = '';

// Tipo de Elemento do Array
switch( typeof( input ) ) {
case 'string':
     output = "'" + input + "'n";
     break;
case 'number':
     output = input + "n";
     break;
case 'boolean':
     output = ( input ? 'true' : 'false' ) + "n";
     break;
case 'object':
     output = ( ( input.reverse ) ? 'Array' : 'Object' ) + "n";
     output += parent_indent + "(n";
     for( var i in input ) {
          output += indent + '[' + i + '] => ' + print_r( input[ i ], indent );
     }
     output += parent_indent + ")n"
     break;
  }
return output;
}