What are the differences between dpm() and dsm()?

What are the differences between [`dpm()`][1] and [`dsm()`][2]?


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dpm() prints a variable to the ‘message’ area of the page using drupal_set_message(). The output and compact and less likely to break the layout of your page.

From the devel docs:

> A note from the devel module: dsm() is
> a legacy function that was poorly
> named; use dpm() instead, since the
> 'p' maps to 'print_r'.

I think we should trust the devel folks on that one.

[`drupal_set_message()`][1] is a Drupal core function that sets messages to be output on the next page view. `drupal_print_message()` is, I believe (based on the examples I found in Google), something people occasionally say by accident when they actually mean `drupal_set_message()`, but not a real function.

Note: there is a [`dpm()`][2] function in the [Devel][3] module, which is short for "drupal print message" that outputs variables for development debugging.


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[`dsm()`][1] is legacy function. It's a call to [`dpm()`][2] as it is, so you should use `dpm()`.


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[Devel Demo][1] is a good drupal module that demonstrate the most of the debugging functions provided by devel module and [here][2] is a good post which gives a brief overview of those functions.


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They're all the same, check how [`dsm()`][1] is defined (one is calling another):

function dsm($input, $name = NULL) {
return dpm($input, $name);
}

So the main one which should be used is `dpm()`, as `dsm()` is deprecated.

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