I have a simple $_GET[]
query var set for showing testing data when pulling down queries from the DB.
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If it's "all smushed together" you can often give the ol' "view source code" a try. Sometimes the dumps, messages and exceptions seem like they're just one long string when it turns out that the line breaks simply don't show. Especially XML trees.
Alternatively, I've once created a small little tool called InteractiveVarDump for this very purpose. It certainly has its limits but it can also be very convenient sometimes. Even though it was designed with PHP 5 in mind.