In terms of previewing the data, I highly recommend installing the plugin "Console Logger" by wgfunstorm with array logging functionality added by me:
Download
This then spits your array out into the console tab:
<img src="http://i.imgur.com/rh69Q.png" border="0">
Or in the case of large arrays:
<img src="http://i.imgur.com/fM6Du.png" border="0">