Krumo: Structured information display solution
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LICENSE updated with latest version of LGPL-2.1 Nov 20, 2017
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Krumo: PHP structured information display solution

KRUMO - version 2.0 of print_r(); and var_dump();

Krumo is a debugging tool, which displays structured information about any PHP variable. It is a nice replacement for print_r() or var_dump() which are used by a lot of PHP developers.

The project was first hosted and maintained at


To put it simply, Krumo is a replacement for print_r() and var_dump(). By definition Krumo is a debugging tool, which displays structured information about any PHP variable.

A lot of developers use print_r() and var_dump() in the means of debugging tools. Although they were intended to present human readble information about a variable, we can all agree that in general they are not. Krumo is an alternative: it does the same job, but it presents the information beautified using CSS/JS/HTML.


Here's a basic example, which will return a report on the array variable passed as argument to it:

krumo(array('a1'=> 'A1', 3, 'red'));

You can dump simultaneously more then one variable - here's another example:

krumo($_SERVER, $_REQUEST);

You probably saw from the examples above that some of the nodes are expandable, so if you want to inspect the nested information, click on them and they will expand; if you do not need that information shown simply click again on it to collapse it. Here's an example to test this:

$x1->x2->x3->x4->x5->x6->x7->x8->x9 = 'X10';

The krumo() is the only standalone function from the package, and this is because basic dumps about variables (like print_r() or var_dump()) are the most common tasks such functionality is used for. The rest of the functionality can be called using static calls to the Krumo class. Here are several more examples:

// print a debug backgrace

// print all the included(or required) files

// print all the included functions

// print all the declared classes

// print all the defined constants

... and so on, etc.

If you want to get the output returned instead of printed, you can use the krumo::fetch() method for that:

$a = krumo::fetch($app, $env);

Please note that the first time you call Krumo the dump it produces also prints the CSS and the JS code used to expand/collapse the dump nodes.


There are several skins pre-installed with this package, but if you wish you can create skins of your own. The skins are simply CSS files that are prepended to the result that Krumo prints.

To the Krumo skin, you have to set it at krumo::$skin:

krumo::$skin = 'blue';

If you want to use images in your CSS (for background, list-style, etc), you have to put them inline inside the CSS class as data URIs:

background-image: url(data:image/gif;base64,R0lGODlhCQAJALMAAP///wAAAP///wAA...AJAAkAAAQTEIAna33USpwt79vncRpZgpcGRAA7);

Here's an example:

background: white url(data:image/gif;base64,R0lGODlhCgACALMAAP///8D...AIAAAQIEMhJA7D4gggAOw==) repeat-x;

Here is what the pre-installed skins look like:

  • skins/default skins/

  • skins/blue skins/

  • skins/orange skins/

  • skins/green skins/

  • skins/ skins/


This project is released under GNU Lesser General Public License v2.1