Argument Picker is a simple API to access and elaborate arguments in a flexible way.
Basically it allows, given URL arguments like:

example.com/myview/make:Volkswagen/model:Polo/year:2008/

to retrieve one of those arguments through a function:

arg_picker_get_selector_argument("make")

which - in the specific example - would return "Volkswagen".

This module essentially adds the possibility to assign labels to arguments, through this syntax:

www.example.com/your_view/LABEL1:ARG1/LABEL2:ARG2/LABEL3:ARG3

and then allows you to retrieve any argument using the label as a reference.

Some of the helper functions are dedicated to specific modules (i.e. Views), enhancing the accessibility of arguments:

www.example.com/your_view/something/bar:1/foo:4/other/parameters

Assuming "your_view" has a "foo" argument, using argument_picker, you could easily setup this argument's default value with:

<?php
return arg_picker_get_view_argument("foo");
?>

which would return "4" (for the example above) or "all" (when the argument is not present).

Basically it's just an alternative to an url querystring with Drupal-specific add-on features, which comes extremely useful when implementing progressive filters (like a faceted search) through views but it also comes very handy for retrieving arguments in dynamic PHP blocks, panel panes, custom modules or wherever you want.

Not to mention that a normal querystring is still usable:

www.example.com/node/add/page/author:Aldus/?query1=...&query2=...

leaving every other querystring-related features intact.

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