Based on James' line, this will create an array of associative arrays with the first row column headers as the keys.
<?php
$csv = array_map('str_getcsv', file($file));
array_walk($csv, function(&$a) use ($csv) {
$a = array_combine($csv[0], $a);
});
array_shift($csv); # remove column header
?>
This will yield something like
[2] => Array
(
[Campaign ID] => 295095038
[Ad group ID] => 22460178158
[Keyword ID] => 3993587178