[PHP trick] A Magical Method to print_r() an Array with Indentation in PHP

Change this:

print_r($i_am_an_array);

To this:

echo '<pre>', print_r($i_am_an_array, true), '</pre>';

And the array will be magically indented right after you press 'F5' in browser.
(Wow! It looks so pretty! <3)

* Note that the 2nd argument of print_r(first_arg, second_arg) equals true means it forces to return the array as a string. But seems this is not a necessity, depending on your case.