Currently its annoying to have to manually parse through the views results data by either doing a print_r() or a dsm() via devel. Does anyone know how to reference a field via PHP when you put in a Global PHP field in either the header or footer of the View?
To reference a Views field result here's the format of the variable when using a PHP Global in the footer/header in a Views display:
$results->field_**<FIELD NAME>**['raw']['**<VARIES DEPENDING ON TYPE OF FIELD>**']
This is in reference to a taxonomy id (tid) reference:
This is in reference to a text field called full_name:
The  represents each result row and the last array value usually changes depending on the field type (text,reference,image, etc.) So its better to dsm or print_r() if you really need to reference something that your not sure of.
Here's a sample output of the array structure so you can get an idea of how its laid out:
Here's a better view of the array output of a view's result when you do a print_r() within the header. I had to apply this to another view and forgot how to reference the variables. So here's the full output when you do a print_r($result->field_field_machine_type): (keep in mind it has to be "field_field" when you reference a field.
Array (  => Array ( [rendered] => Array ( [#markup] => Tablet [#access] => 1 ) [raw] => Array ( [tid] => 105 [taxonomy_term] => stdClass Object ( [tid] => 105 [vid] => 9 [name] => Tablet [description] => [format] => plain_text [weight] => 0 [vocabulary_machine_name] => machine_type [rdf_mapping] => Array ( [rdftype] => Array (  => skos:Concept ) [name] => Array ( [predicates] => Array (  => rdfs:label  => skos:prefLabel ) ) [description] => Array ( [predicates] => Array (  => skos:definition ) ) [vid] => Array ( [predicates] => Array (  => skos:inScheme ) [type] => rel ) [parent] => Array ( [predicates] => Array (  => skos:broader ) [type] => rel ) ) ) ) ) )