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Posted By

ianmonge on 09/13/08


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javascript php printr phpjs


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Javascript equivalent for PHP's print_r

Published in: JavaScript 

URL: http://kevin.vanzonneveld.net/techblog/article/javascript_equivalent_for_phps_print_r/

Description

print_r - Prints human-readable information about a variable

mixed print_r( mixed expression [, bool return] )

print_r() displays information about a variable in a way that's readable by humans. Parameters

* expression

  The expression to be printed.
* return

  If you would like to capture the output of print_r(), use the return parameter. If this parameter is set to TRUE, print_r() will return its output, instead of printing it (which it does by default).

Return Values

If given a string, integer or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects.

Plain TextExpand 
  1. function print_r( array, return_val ) {
  2.     // http://kevin.vanzonneveld.net
  3.     // +   original by: Michael White (http://crestidg.com)
  4.     // +   improved by: Ben Bryan
  5.     // *     example 1: print_r(1, true);
  6.     // *     returns 1: 1
  7.  
  8.     var output = "", pad_char = " ", pad_val = 4;
  9.  
  10.     var formatArray = function (obj, cur_depth, pad_val, pad_char) {
  11.         if (cur_depth > 0) {
  12.             cur_depth++;
  13.         }
  14.  
  15.         var base_pad = repeat_char(pad_val*cur_depth, pad_char);
  16.         var thick_pad = repeat_char(pad_val*(cur_depth+1), pad_char);
  17.         var str = "";
  18.  
  19.         if (obj instanceof Array || obj instanceof Object) {
  20.             str += "Array\n" + base_pad + "(\n";
  21.             for (var key in obj) {
  22.                 if (obj[key] instanceof Array) {
  23.                     str += thick_pad + "["+key+"] => "+formatArray(obj[key], cur_depth+1, pad_val, pad_char);
  24.                 } else {
  25.                     str += thick_pad + "["+key+"] => " + obj[key] + "\n";
  26.                 }
  27.             }
  28.             str += base_pad + ")\n";
  29.         } else if(obj == null || obj == undefined) {
  30.             str = '';
  31.         } else {
  32.             str = obj.toString();
  33.         }
  34.  
  35.         return str;
  36.     };
  37.  
  38.     var repeat_char = function (len, pad_char) {
  39.         var str = "";
  40.         for(var i=0; i < len; i++) { 
  41.             str += pad_char; 
  42.         };
  43.         return str;
  44.     };
  45.     output = formatArray(array, 0, pad_val, pad_char);
  46.  
  47.     if (return_val !== true) {
  48.         document.write("<pre>" + output + "</pre>");
  49.         return true;
  50.     } else {
  51.         return output;
  52.     }
  53. }

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